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using Newtonsoft.Json.Serialization; |
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using System; |
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using System.Collections.Generic; |
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using System.Configuration; |
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using System.Globalization; |
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using System.IO; |
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using System.Linq; |
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using System.Text; |
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using System.Threading.Tasks; |
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using System.Web.Configuration; |
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using System.Web.Mvc; |
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using System.Web.Script.Serialization; |
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namespace Gdsi |
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{ |
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public sealed class MyJsonValueProviderFactory : ValueProviderFactory |
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{ |
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private class EntryLimitedDictionary |
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{ |
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private static int _maximumDepth = GetMaximumDepth(); |
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private readonly IDictionary<string, object> _innerDictionary; |
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private int _itemCount; |
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public EntryLimitedDictionary(IDictionary<string, object> innerDictionary) |
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{ |
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this._innerDictionary = innerDictionary; |
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} |
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public void Add(string key, object value) |
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{ |
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if (++this._itemCount > _maximumDepth) |
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{ |
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throw new InvalidOperationException("MvcResources.JsonValueProviderFactory_RequestTooLarge"); |
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} |
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this._innerDictionary.Add(key, value); |
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} |
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private static int GetMaximumDepth() |
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{ |
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ScriptingJsonSerializationSection section = ConfigurationManager.GetSection("system.web.extensions/scripting/webServices/jsonSerialization") as ScriptingJsonSerializationSection; |
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if (section != null) |
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return section.MaxJsonLength; |
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return 10000; |
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} |
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} |
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private static void AddToBackingStore(EntryLimitedDictionary backingStore, string prefix, object value) |
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{ |
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IDictionary<string, object> dictionary = value as IDictionary<string, object>; |
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if (dictionary != null) |
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{ |
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foreach (KeyValuePair<string, object> current in dictionary) |
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{ |
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AddToBackingStore(backingStore, MakePropertyKey(prefix, current.Key), current.Value); |
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} |
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return; |
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} |
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IList<object> list = value as IList<object>; |
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if (list != null) |
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{ |
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for (int i = 0; i < list.Count; i++) |
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{ |
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AddToBackingStore(backingStore, MakeArrayKey(prefix, i), list[i]); |
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} |
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return; |
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} |
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backingStore.Add(prefix, value); |
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} |
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private static object GetDeserializedObject(ControllerContext controllerContext) |
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{ |
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if (!controllerContext.HttpContext.Request.ContentType.StartsWith("application/json", StringComparison.OrdinalIgnoreCase)) |
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{ |
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return null; |
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} |
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StreamReader streamReader = new StreamReader(controllerContext.HttpContext.Request.InputStream); |
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string text = streamReader.ReadToEnd(); |
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if (string.IsNullOrEmpty(text)) |
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{ |
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return null; |
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} |
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JavaScriptSerializer javaScriptSerializer = new JavaScriptSerializer(); |
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// 解决这个问题： |
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// 使用 JSON JavaScriptSerializer 序列化或还原序列化期间发生错误。字符串的长度超过在 maxJsonLength 属性上设定的值。 |
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javaScriptSerializer.MaxJsonLength = int.MaxValue; |
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// ---------------------------------------- |
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return javaScriptSerializer.DeserializeObject(text); |
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} |
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public override System.Web.Mvc.IValueProvider GetValueProvider(ControllerContext controllerContext) |
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{ |
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if (controllerContext == null) |
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{ |
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throw new ArgumentNullException("controllerContext"); |
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} |
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object deserializedObject = GetDeserializedObject(controllerContext); |
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if (deserializedObject == null) |
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{ |
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return null; |
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} |
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Dictionary<string, object> dictionary = new Dictionary<string, object>(StringComparer.OrdinalIgnoreCase); |
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EntryLimitedDictionary backingStore = new EntryLimitedDictionary(dictionary); |
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AddToBackingStore(backingStore, string.Empty, deserializedObject); |
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return new DictionaryValueProvider<object>(dictionary, CultureInfo.CurrentCulture); |
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} |
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private static string MakeArrayKey(string prefix, int index) |
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{ |
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return prefix + "[" + index.ToString(CultureInfo.InvariantCulture) + "]"; |
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} |
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private static string MakePropertyKey(string prefix, string propertyName) |
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{ |
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if (!string.IsNullOrEmpty(prefix)) |
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{ |
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return prefix + "." + propertyName; |
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} |
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return propertyName; |
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} |
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} |
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} |
