Question

运行时错误找不到列0.以下是我的代码

string connectiostring = (string)ConfigurationSettings.AppSettings["NorthwindConnectionString"];
    SqlConnection conn = new SqlConnection(connectiostring);
    SqlCommand cmd = new SqlCommand("select * from Employees", conn);
    conn.Open();
    SqlDataAdapter adapter = new SqlDataAdapter(cmd);
    DataSet data = new DataSet();
    adapter.Fill(data,"Employees");
    data.Tables["Employees"].Columns.Add("Testcolumn");
    DataTable t1 = new DataTable("Employees");
    DataRow newrow = t1.NewRow();
    newrow[0] = "10";\\this the line i am getting error
    newrow[1] = "Pradeep";
    newrow[2] = "Kumar";
    data.Tables["Employees"].Rows.Add(newrow);
    GridView2.DataSource = data;
    GridView2.DataBind();

请帮帮我谢谢，

Answer 1

您尚未将列添加到DataTable。

t1.Columns.Add(new DataColumn
                   {
                       DataType = string,
                       ColumnName = "First Name"
                   });

为每个列重复此操作，为每个列提供正确的类型。

Answer 2

创建一个在尝试添加行之前添加列的函数。在InitializeComponents中调用方法..

ex.
private void InitTbl(DataTable myTbl)
        {
            myTbl.Columns.Add(new DataColumn("id"));
            myTbl.Columns.Add(new DataColumn("fname"));
            myTbl.Columns.Add(new DataColumn("lname"));
        }

Answer 3

您需要先在表格中添加一些列：

DataTable t1 = new DataTable("Employees");
t1.Columns.Add("column1", typeof(string));
t1.Columns.Add("column2", typeof(string));
t1.Columns.Add("column3", typeof(string));

DataRow newrow = t1.NewRow();
...

Answer 4

我想也许这实际上是你的问题。

DataTable t1 = new DataTable("Employees")

这会创建一个不属于数据集的全新表格对象。

所以你应该用这个替换它

DataTable t1 = data.Tables["Employees"]

从数据集中获取表并将t1变量指向该表。

运行时错误'找不到列0'

4 个答案: