66 lines
2.6 KiB
C#
66 lines
2.6 KiB
C#
namespace System.Web.Mvc {
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using System;
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using System.ComponentModel;
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using System.Data.Linq;
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using System.Linq;
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using System.Reflection;
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using System.Web;
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public static class ModelBinders {
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private static readonly ModelBinderDictionary _binders = CreateDefaultBinderDictionary();
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public static ModelBinderDictionary Binders {
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get {
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return _binders;
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}
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}
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internal static IModelBinder GetBinderFromAttributes(Type type, Func<string> errorMessageAccessor) {
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AttributeCollection allAttrs = TypeDescriptorHelper.Get(type).GetAttributes();
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CustomModelBinderAttribute[] filteredAttrs = allAttrs.OfType<CustomModelBinderAttribute>().ToArray();
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return GetBinderFromAttributesImpl(filteredAttrs, errorMessageAccessor);
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}
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internal static IModelBinder GetBinderFromAttributes(ICustomAttributeProvider element, Func<string> errorMessageAccessor) {
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CustomModelBinderAttribute[] attrs = (CustomModelBinderAttribute[])element.GetCustomAttributes(typeof(CustomModelBinderAttribute), true /* inherit */);
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return GetBinderFromAttributesImpl(attrs, errorMessageAccessor);
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}
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private static IModelBinder GetBinderFromAttributesImpl(CustomModelBinderAttribute[] attrs, Func<string> errorMessageAccessor) {
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// this method is used to get a custom binder based on the attributes of the element passed to it.
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// it will return null if a binder cannot be detected based on the attributes alone.
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if (attrs == null) {
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return null;
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}
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switch (attrs.Length) {
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case 0:
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return null;
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case 1:
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IModelBinder binder = attrs[0].GetBinder();
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return binder;
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default:
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string errorMessage = errorMessageAccessor();
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throw new InvalidOperationException(errorMessage);
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}
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}
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private static ModelBinderDictionary CreateDefaultBinderDictionary() {
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// We can't add a binder to the HttpPostedFileBase type as an attribute, so we'll just
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// prepopulate the dictionary as a convenience to users.
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ModelBinderDictionary binders = new ModelBinderDictionary() {
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{ typeof(HttpPostedFileBase), new HttpPostedFileBaseModelBinder() },
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{ typeof(byte[]), new ByteArrayModelBinder() },
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{ typeof(Binary), new LinqBinaryModelBinder() }
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};
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return binders;
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}
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}
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}
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