C# [错误][DataGridView]索引超出范围

当我尝试更改列标题上的文本时，收到“索引超出范围”错误。见下面的代码：

private void cboMonth_TextChanged(object sender, EventArgs e)
{
    dgvAnnual.DataSource = null;
    dgvAnnual.Rows.Clear();
    dgvAnnual.Columns.Clear();

    BindingSource bSource = new BindingSource();
    bSource.DataSource = ReloadData(dtTable, cboMonth.Text);
    dgvAnnual.DataSource = bSource;

    //Testing Code
    Console.WriteLine(dgvAnnual.Columns.Count); //Col = 4
    Console.WriteLine(dgvAnnual.Rows.Count); //Row = 10

    //The Code below is Working
    string[] str = {"Col1","Col2","Col3","Col4"};
    For(int i = 0;i<dvgAnnual.Columns.Count;i++)
    {
        dvgAnnual.Columns[i].HeaderText = str[i];  //<----- It's ok if it's stay in Loop For, event if I replace i by "0"
    }

    //The Code below not working if it stay outside For
    dgvAnnual.Columns[0].HeaderText = "Col1"; //<----- Error if stay alone like this
}

private void cboMonth\u text已更改（对象发送方，事件参数e）
{
dgvAnnual.DataSource=null；
dgvAnnual.Rows.Clear（）；
dgvAnnual.Columns.Clear（）；
BindingSource bSource=新的BindingSource（）；
bSource.DataSource=重新加载数据（dtTable，cboMonth.Text）；
dgvAnnual.DataSource=b源；
//测试代码
Console.WriteLine（dgvAnnual.Columns.Count）；//Col=4
Console.WriteLine（dgvAnnual.Rows.Count）；//行=10
//下面的代码正在运行
字符串[]str={“Col1”、“Col2”、“Col3”、“Col4”}；
对于（int i=0；i而言，此处列的值为4，但在循环中，您将其范围设定为i=0；到i工作代码：

    private void cboMonth_TextChanged(object sender, EventArgs e)
    {
       dgvAnnual.DataSource = null;
       dgvAnnual.Rows.Clear();
       dgvAnnual.Columns.Clear();

       BindingSource bSource = new BindingSource();
       bSource.DataSource = ReloadData(dtTable, cboMonth.Text);
       dgvAnnual.DataSource = bSource;

       //Using for testing
       Console.WriteLine(dgvAnnual.Columns.Count); //Col = 4
       Console.WriteLine(dgvAnnual.Rows.Count); //Row = 10

       //This Code below Working
       string[] str = {"Col1","Col2","Col3","Col4"};
       For(int i = 0;i<dvgAnnual.Columns.Count;i++)
       {
           dvgAnnual.Columns[i].HeaderText = str[i];  //<----- It's ok if it's stay in Loop For, event if I replace i by "0"
       }
    }

谢谢解决方案：datagridview必须链接到表单

例如：
dgv_Example.Parent=frm_Example
用于（int i=0；i您的代码至少有2个错误无法编译或使其崩溃。请发布一条。@Taw My failed，我在我的代码
For
中更正了它。循环是区分大小写的，因为它的
For
也会调试您的代码，并从逻辑角度考虑它为什么在循环内部工作而不是在循环外部工作。此外，列索引也是
0
based not
1
based也
dgvAnnual.Columns[0]。HeaderText=“Col”+1；
也会出错。无法为文本值指定整数。请将代码更改为该值以测试
dgvAnnual.Columns[0]。HeaderText=“Col”+1.ToString（）
好吧。您仍然没有正确的拼写，但主要问题可能是您有超过4列。因此，您的语法对于for循环是不正确的，它的小写字母
for（int i=0；iI更正了我的代码。这是我在复制和粘贴时没有再次检查它时失败的。抱歉。问题是行dgvAnnual.columns[0].HeaderText=“Col Name Here”。我很快就指出了这一点，因为我注意到有人否决了你的意见，标题文本也应该是一个字符串，然后在循环内部将列名递增为
“Col”+I.ToString（）
这可以在str变量
string str=“Col”的声明中这样处理
我在第一次运行时遇到一个错误（I=0）。我有另一种方法来修复它，但我想请您清楚地理解它。tks
    private void cboMonth_TextChanged(object sender, EventArgs e)
    {
       dgvAnnual.DataSource = null;
       dgvAnnual.Rows.Clear();
       dgvAnnual.Columns.Clear();

       BindingSource bSource = new BindingSource();
       bSource.DataSource = ReloadData(dtTable, cboMonth.Text);
       dgvAnnual.DataSource = bSource;

       //Using for testing
       Console.WriteLine(dgvAnnual.Columns.Count); //Col = 4
       Console.WriteLine(dgvAnnual.Rows.Count); //Row = 10

       //This Code below Working
       string[] str = {"Col1","Col2","Col3","Col4"};
       For(int i = 0;i<dvgAnnual.Columns.Count;i++)
       {
           dvgAnnual.Columns[i].HeaderText = str[i];  //<----- It's ok if it's stay in Loop For, event if I replace i by "0"
       }
    }

    private void cboMonth_TextChanged(object sender, EventArgs e)
    {
        dgvAnnual.DataSource = null;
        dgvAnnual.Rows.Clear();
        dgvAnnual.Columns.Clear();

        BindingSource bSource = new BindingSource();
        bSource.DataSource = ReloadData(dtTable, cboMonth.Text);
        dgvAnnual.DataSource = bSource;

        //Testing Code
        Console.WriteLine(dgvAnnual.Columns.Count); //Col = 4
        Console.WriteLine(dgvAnnual.Rows.Count); //Row = 10

        //This code below not working
        dgvAnnual.Columns[0].HeaderText = "Col " + 1; //<----- Error: Index out of Range
    }

    +   dgvAnnual.Columns[0]    'dgvAnnual.Columns[0]' threw an exception of type 'System.ArgumentOutOfRangeException'  System.Windows.Forms.DataGridViewColumn {System.ArgumentOutOfRangeException}