MVC源码问题（关于设计模式）
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* Copyright (c) Microsoft Corporation. All rights reserved.
*
* This software is subject to the Microsoft Public License (Ms-PL).
* A copy of the license can be found in the license.htm file included
* in this distribution.
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* You must not remove this notice, or any other, from this software.
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namespace System.Web.Mvc {
using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Diagnostics.CodeAnalysis;
using System.Globalization;
using System.Web.Mvc.Resources;
[SuppressMessage("Microsoft.Usage", "CA2237:MarkISerializableTypesWithSerializable",
Justification = "It is not anticipated that users will need to serialize this type.")]
[SuppressMessage("Microsoft.Design", "CA1035:ICollectionImplementationsHaveStronglyTypedMembers",
Justification = "It is not anticipated that users will call FormCollection.CopyTo().")]
[FormCollectionBinder]
public class FormCollection : NameValueCollection {
public FormCollection() {
}
public FormCollection(NameValueCollection collection) {
if (collection == null) {
throw new ArgumentNullException("collection");
}
Add(collection);
}
public IDictionary<string, ValueProviderResult> ToValueProvider() {
CultureInfo currentCulture = CultureInfo.CurrentCulture;
Dictionary<string, ValueProviderResult> dict = new Dictionary<string, ValueProviderResult>(StringComparer.OrdinalIgnoreCase);
string[] keys = AllKeys;
foreach (string key in keys) {
string[] rawValue = GetValues(key);
string attemptedValue = this[key];
ValueProviderResult vpResult = new ValueProviderResult(rawValue, attemptedValue, currentCulture);
dict[key] = vpResult;
}
return dict;
}
public virtual ValueProviderResult GetValue(string name) {
if (String.IsNullOrEmpty(name)) {
throw new ArgumentException(MvcResources.Common_NullOrEmpty, "name");
}
string[] rawValue = GetValues(name);
if (rawValue == null) {
return null;
}
string attemptedValue = this[name];
return new ValueProviderResult(rawValue, attemptedValue, CultureInfo.CurrentCulture);
}
private sealed class FormCollectionBinderAttribute : CustomModelBinderAttribute {
// since the FormCollectionModelBinder.BindModel() method is thread-safe, we only need to keep
// a single instance of the binder around
private static readonly FormCollectionModelBinder _binder = new FormCollectionModelBinder();
public override IModelBinder GetBinder() {
return _binder;
}
// this class is used for generating a FormCollection object
private sealed class FormCollectionModelBinder : IModelBinder {
public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext) {
if (controllerContext == null) {
throw new ArgumentNullException("controllerContext");
}
return new FormCollection(controllerContext.HttpContext.Request.Form);
}
}
}
}
}
