如何解决错误：索引超出范围。必须是非负数且小于集合的大小。参数名称：index [英] How to solve error: Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index

问题描述

我收到此代码的错误：

Hi,

I am getting error with this code:

for (int i = 0; i <= gridview.Rows.Count; i++)
{
    if (!xxx.equals(gridview.Rows[i].Cells[0].Text))
    {
        dr = dt.NewRow();
        dr[0] = */adding value*/
        dt.Rows.Add(dr);
    }
}

我收到此错误 gridview.Rows [ i] .Cells [0] .Text line。

得到的错误是：

I am getting an error with this gridview.Rows[i].Cells[0].Text line.
Error which am getting is:

Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index

这个错误可能是什么原因？



请帮帮我

What may be the reason for this error?

Please help me

推荐答案

取消等于：

Take off the equals:

for (int i = 0; i <= gridview.Rows.Count; i++)

成为

Becomes

for (int i = 0; i < gridview.Rows.Count; i++)

C＃数组是基于零的，但是< =给你一个太多元素。

即你有10行，那么你想0..9不是0..10

C# arrays are zero based, but <= gives you one too many elements.
I.e. is you have 10 Rows, then you want 0..9 not 0..10

你好Kavithale



你必须删除for循环中的'='。



b'cosi值从0开始，例如，如果你在gridview中有10条记录。你必须考虑0到9

Hi Kavithale

You have to remove the '=' in the for loop.

b'cos "i" value is starting from 0. for example, if u have 10 records in a gridview. you have to consider 0 to 9

for (int i = 0; i < gridview.Rows.Count; i++)
{
    if (!xxx.equals(gridview.Rows[i].Cells[0].Text))
    {
        dr = dt.NewRow();
        dr[0] = */adding value*/
        dt.Rows.Add(dr);
    }
}

我的建议是你可以使用foreach迭代器语句来travarse gridview。

代替of

My suggestion is you can use foreach iterator statement to travarse gridview.
Instead of that

for (int i = 0; i <= gridview.Rows.Count; i++)
{
    if (!xxx.Equals(gridview.Rows[i].Cells[0].Text))
    {
        dr = dt.NewRow();
        dr[0] = */adding value*/
        dt.Rows.Add(dr);
    }
}

你可以使用

You can use

 foreach (GridViewRow row in gridview.Rows)
 {
    if (!xxx.Equals(row[i].Cells[0].Text))
    {
        dr = dt.NewRow();
        dr[0] = */adding value*/
        dt.Rows.Add(dr);
    }
}

它更清晰，更易读。如果您遇到意外错误，它将使我们安全。 vs< =等问题。我总是喜欢foreach导航列表实现迭代器模式的列表。

It is more cleaner and readable. It will safe us for accidental errors like you faced < vs <= etc problem. I always prefer foreach to navigate list where list implement iterator pattern.

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