91 lines
3.4 KiB
C#
91 lines
3.4 KiB
C#
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namespace System.Web.UI.WebControls.Expressions {
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using System;
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using System.Collections;
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using System.Collections.Generic;
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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.Web.Resources;
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using System.Web.UI;
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using System.Web.UI.WebControls;
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public class SearchExpression : ParameterDataSourceExpression {
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public string DataFields {
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get {
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return (string)ViewState["DataFields"] ?? String.Empty;
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}
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set {
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ViewState["DataFields"] = value;
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}
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}
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public SearchType SearchType {
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get {
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object o = ViewState["SearchType"];
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return o != null ? (SearchType)o : SearchType.StartsWith;
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}
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set {
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ViewState["SearchType"] = value;
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}
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}
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public StringComparison ComparisonType {
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get {
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object o = ViewState["ComparisonType"];
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return o != null ? (StringComparison)o : StringComparison.OrdinalIgnoreCase;
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}
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set {
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ViewState["ComparisonType"] = value;
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}
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}
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public override IQueryable GetQueryable(IQueryable source) {
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if (source == null) {
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return null;
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}
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if ((DataFields == null) || String.IsNullOrEmpty(DataFields.Trim())) {
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throw new InvalidOperationException(AtlasWeb.Expressions_DataFieldRequired);
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}
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IDictionary<string, object> values = GetValues();
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if (values.Count == 0) {
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throw new InvalidOperationException(AtlasWeb.SearchExpression_ParameterRequired);
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}
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string query = Convert.ToString(values.First().Value, CultureInfo.CurrentCulture);
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if (String.IsNullOrEmpty(query)) {
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return null;
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}
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string[] properties = DataFields.Split(new[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
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// Use the or expression to or the fields together
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List<Expression> searchExpressions = new List<Expression>();
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ParameterExpression parameterExpression = Expression.Parameter(source.ElementType, String.Empty);
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foreach (string p in properties) {
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Expression property = ExpressionHelper.CreatePropertyExpression(parameterExpression, p.Trim());
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searchExpressions.Add(CreateCallExpression(property, query));
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}
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return ExpressionHelper.Where(source,
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Expression.Lambda(ExpressionHelper.Or(searchExpressions),
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parameterExpression));
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}
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private Expression CreateCallExpression(Expression property, string query) {
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// LINQ to SQL does not support the overloads StartsWith(string, StringComparer) or EndsWith(string, StringComparer)
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// and Contains has not overload that takes a StringComparer
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if (SearchType == SearchType.Contains || (ViewState["ComparisonType"] == null)) {
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return Expression.Call(property, SearchType.ToString(), Type.EmptyTypes, Expression.Constant(query, property.Type));
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}
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return Expression.Call(property, SearchType.ToString(), Type.EmptyTypes, Expression.Constant(query, property.Type), Expression.Constant(ComparisonType));
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}
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}
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}
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