指数超出范围。必须是非负数且小于集合的大小。 [英] Index was out of range. Must be non negative and less than the size of the collection.

问题描述

这是我的WebMethod

This is my WebMethod

<WebMethod(Description:="Fetch Nested Albums", EnableSession:=True)> _
<ScriptMethod(ResponseFormat:=ResponseFormat.Json)> _
Public Function moveImages() As Object
    Dim FileCount As Integer = _
        HttpContext.Current.Request.Form(
            HttpContext.Current.Request.Form.Count - 2)
End Function

当我尝试从.aspx页面调用Web服务时，我收到此错误



索引超出范围。必须是非负数且小于集合的大小。



如何访问请求对象？我无法在Web方法中访问会话对象，因此我不得不在Web方法中添加EnableSession：= True。



所以有任何设置请求对象呢？

When i try to call the web service from the .aspx page i get this error

"Index was out of range. Must be non negative and less than the size of the collection."

How can i access the request Object? I was not able to access the session object in the web method, so i had to add EnableSession:=True in the Web Method.

So is there any setting for the request Object too?

推荐答案

我看到这一行：

Hi,

I see this line:

Dim FileCount As Integer =
        HttpContext.Current.Request.Form(
            HttpContext.Current.Request.Form.Count - 2)

如果 HttpContext.Current.Request.Form.Count 小于2，那么你试着拿一个表格变量在-1处（或-2，-3，...）。

If HttpContext.Current.Request.Form.Count is less than 2, then you try to take a form variable at place -1 (or -2, -3, ...).

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