如何解决索引超出范围的异常？ [英] How to solve Index Out of range exception ?

问题描述

编译错误：

描述：编译为此请求提供服务所需的资源时发生错误。请查看以下具体错误详细信息并正确修改源代码。

Compilation Error:
Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.

Compiler Error Message: CS0266: Cannot implicitly convert type 'long' to 'int'. An explicit conversion exists (are you missing a cast?)

Source Error:


Line 270:
Line 271:            
Line 272:            n_sno = Convert.ToInt64(((TextBox)(row.Cells[1].Controls[0])).Text);
Line 273:            n_date = ((TextBox)(row.Cells[2].Controls[1])).Text.Trim();
Line 274:            n_c_ref = ((TextBox)(row.Cells[3].Controls[2])).Text.Trim();


Source File: c:\Users\bhushan.COMTEK\Desktop\Halo Convert in Publication\PublicationWeb\Indent.aspx.cs    Line: 272

plz check这个代码.......

首先我取旧值然后新值然后新值插入gridvalue但是当我采取新的序列号时：显示异常 - 索引出范围。



错误行是这样的：n_sno = Convert.ToInt16（（（TextBox）（row.Cells [1] .Controls [0]））。Text） ;

plz check this code.......
firstly i''m taking old values then new values then new value inserted in gridvalue but when i''m taking new serialnumber: show exception- Index out of range.

Error line is this : n_sno = Convert.ToInt16(((TextBox)(row.Cells[1].Controls[0])).Text);

protected void grid_indent_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
    try
    {
        // retrieve the table from the session object...
       // DataTable dt = (DataTable)Session["grid_value"];

        // update the values of grid...
        List<item_list> objList = (List<item_list>)Session["listdata"];

        GridViewRow row = grid_indent.Rows[e.RowIndex];
        
        o_sno = objList[row.DataItemIndex].serialnumber;
        o_date = objList[row.DataItemIndex].date;
        o_c_ref = objList[row.DataItemIndex].coderef;
        o_i_name = objList[row.DataItemIndex].item_name;
        o_inhand = objList[row.DataItemIndex].inhand;
        o_request = objList[row.DataItemIndex].newrequest;
        o_rate = objList[row.DataItemIndex].rate;
        o_amt = objList[row.DataItemIndex].amount;
     
        n_sno = Convert.ToInt16(((TextBox)(row.Cells[1].Controls[0])).Text);
        n_date = ((TextBox)(row.Cells[2].Controls[1])).Text.Trim();
        n_c_ref = ((TextBox)(row.Cells[3].Controls[2])).Text.Trim();
        n_i_name = ((TextBox)(row.Cells[4].Controls[3])).Text.Trim();
        n_inhand = Convert.ToInt32(((TextBox)(row.Cells[5].Controls[4])).Text.Trim());
        n_request = Convert.ToInt32(((TextBox)(row.Cells[6].Controls[5])).Text.Trim());
        n_rate = ((TextBox)(row.Cells[7].Controls[6])).Text.Trim();
        n_amt = ((TextBox)(row.Cells[8].Controls[7])).Text.Trim();

        objList[row.DataItemIndex].serialnumber =n_sno;
        objList[row.DataItemIndex].date = n_date;
        objList[row.DataItemIndex].coderef = n_c_ref;
        objList[row.DataItemIndex].item_name = n_i_name;
        objList[row.DataItemIndex].inhand = n_inhand;
        objList[row.DataItemIndex].newrequest = n_request;
        objList[row.DataItemIndex].rate = n_rate;
        objList[row.DataItemIndex].amount = n_amt;
    
        grid_indent.EditIndex = -1;
        popUpData();
    }
    catch (Exception ex)
    {
        Response.Write(ex.Message);
    }
    finally
    { }
}

在此先感谢...

Bhushan

thanks in advance...
Bhushan

推荐答案

如果您想了解处理此类问题的方法，请查看本文问题

掌握视觉调试Studio 2010 - 初学者指南 [ ^ ]



实际上重读了你的问题 - 也许你需要的只是一双额外的眼睛： ）

Have a look at this article if you want to know about ways to deal with this sort of problem
Mastering Debugging in Visual Studio 2010 - A Beginner''s Guide[^]

Having reread your question actually - maybe all you needed was a pair of extra eyes :)

看起来 n_sno 被定义为 int ，即32位整数变量。因此，你需要一个 Convert.ToInt32（）。

就你的IndexOutOfRangeException而言，检查该行是否有一个索引为1的Cell ，并且该单元格具有索引为0的控件。

Looks like n_sno was defined to be an int, i.e. a 32 bit integer variable. Hence, you need a Convert.ToInt32().
As far as your IndexOutOfRangeException is concerned, check that the row has a Cell with index 1, and that that cell has a control with index 0.

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