c# - 错误::::Index 超出范围。必须是非负数且小于集合的大小。参数名称：索引

Question

可能重复：
索引超出范围。必须是非负数且小于集合的大小。参数名称：索引

当我单击更新按钮时，我收到此错误我的更新单击事件

protected void btnUpdate_Click(object sender, CommandEventArgs e)
{
    int idx = Convert.ToInt32(e.CommandArgument);
    GridViewRow gr = gvResTasks.Rows[idx];

当 idx值达到 19 时，它工作正常。当它大于 19 时会发生此错误。

更新按钮.aspx

<ItemTemplate> 
  <asp:Button runat="server" ID="btnUpdate" Text="Update" OnCommand="btnUpdate_Click" CommandArgument="<%# Container.DataItemIndex %>" /> 
  <%--<asp:Button runat="server" ID="Button1" Text="Update" onclick="btnUpdate_Click" />--%> 
</ItemTemplate>                                

更新按钮.aspx.cs

protected void btnUpdate_Click(object sender, CommandEventArgs e)
{
   // int idx = Convert.ToInt32(e.CommandArgument);
    int idx = Convert.ToInt32(e.CommandArgument);
    GridViewRow gr = gvResTasks.Rows[idx];

    Label hf = (Label)gr.FindControl("hdEmployeeID");

    string sEmpID = hf.Text;
    lblEmployeeID.Text = sEmpID;
    lblEmployeeID2.Text = sEmpID;

    int Rows = gvResTasks.Rows.Count;
    for (int x = 0; x < Rows; x++)
    {
        GridViewRow tr = gvResTasks.Rows[x];
        tr.CssClass = "WhiteBack";
    }

    ClearMessages();

    gr.CssClass = "TealBack";

    string sSubTaskID = gr.Cells[0].Text;
    lblSubTaskID.Text = sSubTaskID;

    lblSubTaskName.Text = @gr.Cells[1].Text;

    LoadSubTaskInfo();

    Single sProgress = 0;
    Boolean bok = Single.TryParse(lblActualProgress.Text, out sProgress);

    DateTime dPF = DateTime.Parse(lblPlannedFinish.Text);

    if (dPF > DateTime.Now)
    {
        btnFinish.Enabled = false;
    }
    else if (dPF <= DateTime.Now)
    {
        if (sProgress >= 100)
        {
            btnFinish.Enabled = false;
        }
        else
        {
            btnFinish.Enabled = true;
        }
        //btnFinish.Enabled = true;
    }

    panelUpdate.CssClass = "float";
    panelUpdate.Visible = false;
    if (gr.Cells[7].Text != "True")
    {
        panelUpdate.Visible = true;
    }
}

Answer 1

您正在尝试从 gvResTasks 中获取一个值，该值位于 gridView 中高于其中行数的位置。因此，索引超出范围的错误。