选择ASP。NET MVC 5修复:

(我的答案与上面的mfc答案相似，只是有一些小变化)

我还没准备好改用Json。NET还没有，在我的情况下，错误发生在请求期间。在我的场景中，最好的方法是修改实际的JsonValueProviderFactory，它将修复应用到全局项目，可以通过编辑global.cs文件来完成。

JsonValueProviderConfig.Config(ValueProviderFactories.Factories);

添加一个网页。配置项:

<add key="aspnet:MaxJsonLength" value="20971520" />

然后创建以下两个类

public class JsonValueProviderConfig
{
    public static void Config(ValueProviderFactoryCollection factories)
    {
        var jsonProviderFactory = factories.OfType<JsonValueProviderFactory>().Single();
        factories.Remove(jsonProviderFactory);
        factories.Add(new CustomJsonValueProviderFactory());
    }
}

这基本上是在System.Web.Mvc中找到的默认实现的精确副本，但添加了可配置的web。配置appsetting值aspnet:MaxJsonLength。

public class CustomJsonValueProviderFactory : ValueProviderFactory
{

    /// <summary>Returns a JSON value-provider object for the specified controller context.</summary>
    /// <returns>A JSON value-provider object for the specified controller context.</returns>
    /// <param name="controllerContext">The controller context.</param>
    public override IValueProvider GetValueProvider(ControllerContext controllerContext)
    {
        if (controllerContext == null)
            throw new ArgumentNullException("controllerContext");

        object deserializedObject = CustomJsonValueProviderFactory.GetDeserializedObject(controllerContext);
        if (deserializedObject == null)
            return null;

        Dictionary<string, object> strs = new Dictionary<string, object>(StringComparer.OrdinalIgnoreCase);
        CustomJsonValueProviderFactory.AddToBackingStore(new CustomJsonValueProviderFactory.EntryLimitedDictionary(strs), string.Empty, deserializedObject);

        return new DictionaryValueProvider<object>(strs, CultureInfo.CurrentCulture);
    }

    private static object GetDeserializedObject(ControllerContext controllerContext)
    {
        if (!controllerContext.HttpContext.Request.ContentType.StartsWith("application/json", StringComparison.OrdinalIgnoreCase))
            return null;

        string fullStreamString = (new StreamReader(controllerContext.HttpContext.Request.InputStream)).ReadToEnd();
        if (string.IsNullOrEmpty(fullStreamString))
            return null;

        var serializer = new JavaScriptSerializer()
        {
            MaxJsonLength = CustomJsonValueProviderFactory.GetMaxJsonLength()
        };
        return serializer.DeserializeObject(fullStreamString);
    }

    private static void AddToBackingStore(EntryLimitedDictionary backingStore, string prefix, object value)
    {
        IDictionary<string, object> strs = value as IDictionary<string, object>;
        if (strs != null)
        {
            foreach (KeyValuePair<string, object> keyValuePair in strs)
                CustomJsonValueProviderFactory.AddToBackingStore(backingStore, CustomJsonValueProviderFactory.MakePropertyKey(prefix, keyValuePair.Key), keyValuePair.Value);

            return;
        }

        IList lists = value as IList;
        if (lists == null)
        {
            backingStore.Add(prefix, value);
            return;
        }

        for (int i = 0; i < lists.Count; i++)
        {
            CustomJsonValueProviderFactory.AddToBackingStore(backingStore, CustomJsonValueProviderFactory.MakeArrayKey(prefix, i), lists[i]);
        }
    }

    private class EntryLimitedDictionary
    {
        private static int _maximumDepth;

        private readonly IDictionary<string, object> _innerDictionary;

        private int _itemCount;

        static EntryLimitedDictionary()
        {
            _maximumDepth = CustomJsonValueProviderFactory.GetMaximumDepth();
        }

        public EntryLimitedDictionary(IDictionary<string, object> innerDictionary)
        {
            this._innerDictionary = innerDictionary;
        }

        public void Add(string key, object value)
        {
            int num = this._itemCount + 1;
            this._itemCount = num;
            if (num > _maximumDepth)
            {
                throw new InvalidOperationException("The length of the string exceeds the value set on the maxJsonLength property.");
            }
            this._innerDictionary.Add(key, value);
        }
    }

    private static string MakeArrayKey(string prefix, int index)
    {
        return string.Concat(prefix, "[", index.ToString(CultureInfo.InvariantCulture), "]");
    }

    private static string MakePropertyKey(string prefix, string propertyName)
    {
        if (string.IsNullOrEmpty(prefix))
        {
            return propertyName;
        }
        return string.Concat(prefix, ".", propertyName);
    }

    private static int GetMaximumDepth()
    {
        int num;
        NameValueCollection appSettings = ConfigurationManager.AppSettings;
        if (appSettings != null)
        {
            string[] values = appSettings.GetValues("aspnet:MaxJsonDeserializerMembers");
            if (values != null && values.Length != 0 && int.TryParse(values[0], out num))
            {
                return num;
            }
        }
        return 1000;
    }

    private static int GetMaxJsonLength()
    {
        int num;
        NameValueCollection appSettings = ConfigurationManager.AppSettings;
        if (appSettings != null)
        {
            string[] values = appSettings.GetValues("aspnet:MaxJsonLength");
            if (values != null && values.Length != 0 && int.TryParse(values[0], out num))
            {
                return num;
            }
        }
        return 1000;
    }
}

如果你在视图中遇到这类问题，你可以使用下面的方法来解决。这里我用的是牛顿软包装。

@using Newtonsoft.Json
<script type="text/javascript">
    var partData = @Html.Raw(JsonConvert.SerializeObject(ViewBag.Part));
</script>

来点属性魔法怎么样?

[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, Inherited = true, AllowMultiple = false)]
public class MaxJsonSizeAttribute : ActionFilterAttribute
{
    // Default: 10 MB worth of one byte chars
    private int maxLength = 10 * 1024 * 1024;

    public int MaxLength
    {
        set
        {
            if (value < 0) throw new ArgumentOutOfRangeException("value", "Value must be at least 0.");

            maxLength = value;
        }
        get { return maxLength; }
    }

    public override void OnActionExecuted(ActionExecutedContext filterContext)
    {
        JsonResult json = filterContext.Result as JsonResult;
        if (json != null)
        {
            if (maxLength == 0)
            {
                json.MaxJsonLength = int.MaxValue;
            }
            else
            {
                json.MaxJsonLength = maxLength;
            }
        }
    }
}

然后，您可以使用全局过滤器配置或控制器/动作在全局中应用它。

如果，在实现上述添加到您的网页。config，你会得到一个“无法识别的配置部分system.web.extensions”。的错误，然后尝试将此添加到您的网页。<ConfigSections> section中的config:

            <sectionGroup name="system.web.extensions" type="System.Web.Extensions">
              <sectionGroup name="scripting" type="System.Web.Extensions">
                    <sectionGroup name="webServices" type="System.Web.Extensions">
                          <section name="jsonSerialization" type="System.Web.Extensions"/>
                    </sectionGroup>
              </sectionGroup>
        </sectionGroup>

你不需要使用web.config 您可以在传递列表的catch值期间使用short属性 例如 像这样声明一个模型

public class BookModel
    {
        public decimal id { get; set; }  // 1 

        public string BN { get; set; } // 2 Book Name

        public string BC { get; set; } // 3 Bar Code Number

        public string BE { get; set; } // 4 Edition Name

        public string BAL { get; set; } // 5 Academic Level

        public string BCAT { get; set; } // 6 Category
}

这里我用的是短比例 公元前=条形码 BE=图书版本等等

我在ASP中遇到了这个问题。NET Web表单。它完全忽略了网络。配置文件设置，所以我这样做:

        JavaScriptSerializer serializer = new JavaScriptSerializer();

        serializer.MaxJsonLength = Int32.MaxValue; 

        return serializer.Serialize(response);

当然，总的来说，这是一种糟糕的做法。如果您要在web服务调用中发送这么多数据，您应该考虑另一种方法。