无法通过GET AJAX web请求返回词典（字符串，字符串），可与POST [英] Can't return Dictionary(Of String, String) via GET ajax web request, works with POST

问题描述

我有以下web方法：

    <WebMethod()> _
    <ScriptMethod(ResponseFormat:=ResponseFormat.Json, UseHttpGet:=True, XmlSerializeString:=True)> _
    Public Function GetDictionary() As Dictionary(Of String, String)

        Dim d As New Dictionary(Of String, String)
        d.Add("key1", "value1")
        d.Add("key2", "value2")
        Return d

    End Function

我可以检索结果精（JSON）如果我使用HttpPost从我的AJAX调用，但只要我使用HTTPGET我得到以下异常：

I can retrieve the results fine (JSON) if I use HttpPost from my ajax call, but as soon as I use HttpGet I get the following exception:

System.NotSupportedException：类型System.Collections.Generic.Dictionary`2 [System.String，mscorlib中 ，版本= 2.0.0.0，文化=中性公钥= b77a5c561934e089]，[System.String，mscorlib程序，版本 = 2.0.0.0，文化=中性公钥= b77a5c561934e089]]不支持，因为它实现IDictionary的

System.NotSupportedException: The type System.Collections.Generic.Dictionary`2[[System.String, mscorlib , Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.String, mscorlib, Version =2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]] is not supported because it implements IDictionary

我想用HTTPGET这里，这样的结果可以被缓存。

I wanted to use HttpGet here so that the result can be cached.

我想尽变化要求这一点，但没有运气。有任何想法吗？与得到的是这可能吗？

I tried every variation of calling this, but no luck. Any ideas? Is this possible with GET?

推荐答案

另一种方法是改变返回类型为String，然后通过的 JavaScriptSerializer.Serialize 。这可能不是正是你与返回的字典中有意，但它会在JSON响应key = value对。

Another alternative is to change the Return type to a String and then convert the Dictionary to JSON via JavaScriptSerializer.Serialize. This may not be exactly what you were intending with returning a Dictionary but it will be key=value pairs in the JSON Response.

<WebMethod()> _
<ScriptMethod(ResponseFormat:=ResponseFormat.Json, UseHttpGet:=True, XmlSerializeString:=True)> _
Public Function GetDictionary() As String

    Dim d As New Dictionary(Of String, String)
    d.Add("key1", "value1")
    d.Add("key2", "value2")
    Return New JavaScriptSerializer().Serialize(d)

End Function

和生成的JSON：

{"key1":"value1","key2":"value2"}

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