我得到错误“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&quot。。我会解决它吗？

问题描述

private void BindGrid()
    {
        int selectedRowIndex = GridView1.SelectedIndex;
        int pId = (int)GridView1.DataKeys[selectedRowIndex].Value;//I get error in this line.
        SqlConnection conn;
        SqlCommand comm;
        SqlDataReader reader;
        string connectionString =
        ConfigurationManager.ConnectionStrings[
        "ConnectionString"].ConnectionString;
        conn = new SqlConnection(connectionString);
        comm = new SqlCommand("SELECT ProductId, ProductName, Price FROM Product " +
        "WHERE ProductId=@ProductId", conn);
        comm.Parameters.Add("ProductId", SqlDbType.Int);
        comm.Parameters["ProductId"].Value = pId;
        try
        {
            conn.Open();
            reader = comm.ExecuteReader();
            employeeDetails.DataSource = reader;
            employeeDetails.DataKeyNames = new string[] { "ProductId" };
            employeeDetails.DataBind();
            reader.Close();
        }
        finally
        {
            conn.Close();
        }
    }

推荐答案

GridView控件中所选行的从零开始的索引。 默认值为-1，表示当前没有选择行。

The zero-based index of the selected row in a GridView control. The default is -1, which indicates that no row is currently selected.

您可以这样修改代码：

You could modify your code this way:

private void BindGrid()
    {
        int selectedRowIndex = GridView1.SelectedIndex;
        if ( selectedRowIndex < 0) return;
        //...

}

}

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