System.ArgumentOutOfRangeException：索引超出范围

Question

I Have another Issue with my Code (ARGGGH!) I have a request.querystring that I am calling and i get the following error Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index

public void getAccountRef()
{
    string getAccountRef = (string)Request.QueryString["AccountRef"].ToString();

    SqlDataSource1.SelectParameters[0].DefaultValue = getAccountRef;
}

Any thoughts why? I am trying to parse the account ref which is going to formatted like REDIT1

Cheers

Justin

Answer 1

I'd bet that SqlDataSource1 had no parameters set, so your attempt to access the first (item 0) fails as the index must be in the range from 0 to Count-1 (which nothing satisfies in this case). You need to add the parameter.

Also note that:

string getAccountRef = (string)Request.QueryString["AccountRef"].ToString()

Is doubly redundant. There's no need to cast the result of .ToString() to string, as ToString() always returns a string.

There's also no need to call it on the result of Request.Querystring[fieldName] as that also always returns a string. The following would suffice:

string getAccountRef = Request.QueryString["AccountRef"];

Answer 2

I got it! there was not a parameter set in my SQLDataSource!

<SelectParameters>
    <asp:Parameter DefaultValue="1" Name="AccountRef" Type="String" />
</SelectParameters>

Thanks guy's