246 lines
15 KiB
C#
246 lines
15 KiB
C#
namespace System.Web.Mvc.Html {
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using System.Collections;
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using System.Collections.Generic;
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using System.Diagnostics.CodeAnalysis;
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using System.Globalization;
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using System.Linq;
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using System.Linq.Expressions;
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using System.Text;
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using System.Web;
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using System.Web.Mvc.Resources;
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public static class SelectExtensions {
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// DropDownList
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public static MvcHtmlString DropDownList(this HtmlHelper htmlHelper, string name) {
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return DropDownList(htmlHelper, name, null /* selectList */, null /* optionLabel */, null /* htmlAttributes */);
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}
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public static MvcHtmlString DropDownList(this HtmlHelper htmlHelper, string name, string optionLabel) {
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return DropDownList(htmlHelper, name, null /* selectList */, optionLabel, null /* htmlAttributes */);
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}
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public static MvcHtmlString DropDownList(this HtmlHelper htmlHelper, string name, IEnumerable<SelectListItem> selectList) {
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return DropDownList(htmlHelper, name, selectList, null /* optionLabel */, null /* htmlAttributes */);
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}
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public static MvcHtmlString DropDownList(this HtmlHelper htmlHelper, string name, IEnumerable<SelectListItem> selectList, object htmlAttributes) {
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return DropDownList(htmlHelper, name, selectList, null /* optionLabel */, HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes));
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}
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public static MvcHtmlString DropDownList(this HtmlHelper htmlHelper, string name, IEnumerable<SelectListItem> selectList, IDictionary<string, object> htmlAttributes) {
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return DropDownList(htmlHelper, name, selectList, null /* optionLabel */, htmlAttributes);
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}
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public static MvcHtmlString DropDownList(this HtmlHelper htmlHelper, string name, IEnumerable<SelectListItem> selectList, string optionLabel) {
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return DropDownList(htmlHelper, name, selectList, optionLabel, null /* htmlAttributes */);
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}
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public static MvcHtmlString DropDownList(this HtmlHelper htmlHelper, string name, IEnumerable<SelectListItem> selectList, string optionLabel, object htmlAttributes) {
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return DropDownList(htmlHelper, name, selectList, optionLabel, HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes));
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}
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public static MvcHtmlString DropDownList(this HtmlHelper htmlHelper, string name, IEnumerable<SelectListItem> selectList, string optionLabel, IDictionary<string, object> htmlAttributes) {
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return DropDownListHelper(htmlHelper, name, selectList, optionLabel, htmlAttributes);
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}
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[SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures", Justification = "This is an appropriate nesting of generic types")]
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public static MvcHtmlString DropDownListFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, IEnumerable<SelectListItem> selectList) {
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return DropDownListFor(htmlHelper, expression, selectList, null /* optionLabel */, null /* htmlAttributes */);
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}
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[SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures", Justification = "This is an appropriate nesting of generic types")]
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public static MvcHtmlString DropDownListFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, IEnumerable<SelectListItem> selectList, object htmlAttributes) {
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return DropDownListFor(htmlHelper, expression, selectList, null /* optionLabel */, HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes));
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}
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[SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures", Justification = "This is an appropriate nesting of generic types")]
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public static MvcHtmlString DropDownListFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, IEnumerable<SelectListItem> selectList, IDictionary<string, object> htmlAttributes) {
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return DropDownListFor(htmlHelper, expression, selectList, null /* optionLabel */, htmlAttributes);
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}
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[SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures", Justification = "This is an appropriate nesting of generic types")]
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public static MvcHtmlString DropDownListFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, IEnumerable<SelectListItem> selectList, string optionLabel) {
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return DropDownListFor(htmlHelper, expression, selectList, optionLabel, null /* htmlAttributes */);
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}
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[SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures", Justification = "This is an appropriate nesting of generic types")]
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public static MvcHtmlString DropDownListFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, IEnumerable<SelectListItem> selectList, string optionLabel, object htmlAttributes) {
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return DropDownListFor(htmlHelper, expression, selectList, optionLabel, HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes));
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}
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[SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters", Justification = "Users cannot use anonymous methods with the LambdaExpression type")]
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[SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures", Justification = "This is an appropriate nesting of generic types")]
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public static MvcHtmlString DropDownListFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, IEnumerable<SelectListItem> selectList, string optionLabel, IDictionary<string, object> htmlAttributes) {
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if (expression == null) {
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throw new ArgumentNullException("expression");
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}
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return DropDownListHelper(htmlHelper, ExpressionHelper.GetExpressionText(expression), selectList, optionLabel, htmlAttributes);
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}
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private static MvcHtmlString DropDownListHelper(HtmlHelper htmlHelper, string expression, IEnumerable<SelectListItem> selectList, string optionLabel, IDictionary<string, object> htmlAttributes) {
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return SelectInternal(htmlHelper, optionLabel, expression, selectList, false /* allowMultiple */, htmlAttributes);
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}
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// ListBox
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public static MvcHtmlString ListBox(this HtmlHelper htmlHelper, string name) {
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return ListBox(htmlHelper, name, null /* selectList */, null /* htmlAttributes */);
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}
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public static MvcHtmlString ListBox(this HtmlHelper htmlHelper, string name, IEnumerable<SelectListItem> selectList) {
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return ListBox(htmlHelper, name, selectList, (IDictionary<string, object>)null);
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}
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public static MvcHtmlString ListBox(this HtmlHelper htmlHelper, string name, IEnumerable<SelectListItem> selectList, object htmlAttributes) {
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return ListBox(htmlHelper, name, selectList, HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes));
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}
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public static MvcHtmlString ListBox(this HtmlHelper htmlHelper, string name, IEnumerable<SelectListItem> selectList, IDictionary<string, object> htmlAttributes) {
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return ListBoxHelper(htmlHelper, name, selectList, htmlAttributes);
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}
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[SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures", Justification = "This is an appropriate nesting of generic types")]
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public static MvcHtmlString ListBoxFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, IEnumerable<SelectListItem> selectList) {
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return ListBoxFor(htmlHelper, expression, selectList, null /* htmlAttributes */);
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}
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[SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures", Justification = "This is an appropriate nesting of generic types")]
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public static MvcHtmlString ListBoxFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, IEnumerable<SelectListItem> selectList, object htmlAttributes) {
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return ListBoxFor(htmlHelper, expression, selectList, HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes));
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}
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[SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters", Justification = "Users cannot use anonymous methods with the LambdaExpression type")]
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[SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures", Justification = "This is an appropriate nesting of generic types")]
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public static MvcHtmlString ListBoxFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, IEnumerable<SelectListItem> selectList, IDictionary<string, object> htmlAttributes) {
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if (expression == null) {
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throw new ArgumentNullException("expression");
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}
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return ListBoxHelper(htmlHelper,
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ExpressionHelper.GetExpressionText(expression),
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selectList,
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htmlAttributes);
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}
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private static MvcHtmlString ListBoxHelper(HtmlHelper htmlHelper, string name, IEnumerable<SelectListItem> selectList, IDictionary<string, object> htmlAttributes) {
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return SelectInternal(htmlHelper, null /* optionLabel */, name, selectList, true /* allowMultiple */, htmlAttributes);
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}
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// Helper methods
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private static IEnumerable<SelectListItem> GetSelectData(this HtmlHelper htmlHelper, string name) {
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object o = null;
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if (htmlHelper.ViewData != null) {
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o = htmlHelper.ViewData.Eval(name);
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}
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if (o == null) {
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throw new InvalidOperationException(
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String.Format(
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CultureInfo.CurrentCulture,
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MvcResources.HtmlHelper_MissingSelectData,
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name,
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"IEnumerable<SelectListItem>"));
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}
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IEnumerable<SelectListItem> selectList = o as IEnumerable<SelectListItem>;
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if (selectList == null) {
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throw new InvalidOperationException(
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String.Format(
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CultureInfo.CurrentCulture,
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MvcResources.HtmlHelper_WrongSelectDataType,
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name,
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o.GetType().FullName,
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"IEnumerable<SelectListItem>"));
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}
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return selectList;
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}
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internal static string ListItemToOption(SelectListItem item) {
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TagBuilder builder = new TagBuilder("option") {
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InnerHtml = HttpUtility.HtmlEncode(item.Text)
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};
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if (item.Value != null) {
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builder.Attributes["value"] = item.Value;
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}
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if (item.Selected) {
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builder.Attributes["selected"] = "selected";
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}
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return builder.ToString(TagRenderMode.Normal);
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}
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private static MvcHtmlString SelectInternal(this HtmlHelper htmlHelper, string optionLabel, string name, IEnumerable<SelectListItem> selectList, bool allowMultiple, IDictionary<string, object> htmlAttributes) {
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string fullName = htmlHelper.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(name);
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if (String.IsNullOrEmpty(fullName)) {
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throw new ArgumentException(MvcResources.Common_NullOrEmpty, "name");
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}
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bool usedViewData = false;
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// If we got a null selectList, try to use ViewData to get the list of items.
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if (selectList == null) {
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selectList = htmlHelper.GetSelectData(fullName);
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usedViewData = true;
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}
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object defaultValue = (allowMultiple) ? htmlHelper.GetModelStateValue(fullName, typeof(string[])) : htmlHelper.GetModelStateValue(fullName, typeof(string));
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// If we haven't already used ViewData to get the entire list of items then we need to
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// use the ViewData-supplied value before using the parameter-supplied value.
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if (!usedViewData) {
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if (defaultValue == null) {
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defaultValue = htmlHelper.ViewData.Eval(fullName);
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}
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}
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if (defaultValue != null) {
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IEnumerable defaultValues = (allowMultiple) ? defaultValue as IEnumerable : new[] { defaultValue };
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IEnumerable<string> values = from object value in defaultValues select Convert.ToString(value, CultureInfo.CurrentCulture);
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HashSet<string> selectedValues = new HashSet<string>(values, StringComparer.OrdinalIgnoreCase);
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List<SelectListItem> newSelectList = new List<SelectListItem>();
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foreach (SelectListItem item in selectList) {
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item.Selected = (item.Value != null) ? selectedValues.Contains(item.Value) : selectedValues.Contains(item.Text);
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newSelectList.Add(item);
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}
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selectList = newSelectList;
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}
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// Convert each ListItem to an <option> tag
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StringBuilder listItemBuilder = new StringBuilder();
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// Make optionLabel the first item that gets rendered.
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if (optionLabel != null) {
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listItemBuilder.AppendLine(ListItemToOption(new SelectListItem() { Text = optionLabel, Value = String.Empty, Selected = false }));
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}
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foreach (SelectListItem item in selectList) {
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listItemBuilder.AppendLine(ListItemToOption(item));
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}
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TagBuilder tagBuilder = new TagBuilder("select") {
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InnerHtml = listItemBuilder.ToString()
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};
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tagBuilder.MergeAttributes(htmlAttributes);
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tagBuilder.MergeAttribute("name", fullName, true /* replaceExisting */);
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tagBuilder.GenerateId(fullName);
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if (allowMultiple) {
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tagBuilder.MergeAttribute("multiple", "multiple");
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}
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// If there are any errors for a named field, we add the css attribute.
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ModelState modelState;
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if (htmlHelper.ViewData.ModelState.TryGetValue(fullName, out modelState)) {
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if (modelState.Errors.Count > 0) {
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tagBuilder.AddCssClass(HtmlHelper.ValidationInputCssClassName);
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}
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}
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tagBuilder.MergeAttributes(htmlHelper.GetUnobtrusiveValidationAttributes(name));
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return tagBuilder.ToMvcHtmlString(TagRenderMode.Normal);
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}
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}
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}
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