将行添加到组合框数据表

Question

我想向组合框中的数据表添加新行，但在添加时收到错误

"Input array is longer than the number of columns in this table."

组合框：字符串，整数 "ALL",0 "A",1 "B",2

下面是我的代码

SqlDataAdapter _dataAdapter_myReader = new SqlDataAdapter();
DataTable _dataTable_myReader = new DataTable();

public Form_ListAll() 
{
    _dataAdapter_myReader = new SqlDataAdapter("SELECT DISTINCT CASE WHEN type = '1' then 'A' WHEN type = '2' then 'B' END AS Descp, type from table ORDER BY type", myConnection);

    _dataTable_myReader.Rows.Add(new object[] { "ALL", 0 });
    _dataAdapter_myReader.Fill(_dataTable_myReader);
    _cmbBoxType.DataSource = _dataTable_myReader;
    _cmbBoxType.DisplayMember = "Descp";
    _cmbBoxType.ValueMember = "type";
    _cmbBoxType.SelectedIndex = 0;
    ...
}

Answer 1

您需要先创建 DataTable 结构，然后然后使用 add,

添加行

_dataAdapter_myReader = new SqlDataAdapter("SELECT DISTINCT CASE WHEN type = '1' then 'A' WHEN type = '2' then 'B' END AS Descp, type from table ORDER BY type", myConnection);

_dataAdapter_myReader.Fill(_dataTable_myReader);

DataRow dr = callsTable.NewRow();

博士["Descp"] = "All";
博士["type"] = "0";

_dataAdapter_myReader.Rows.InsertAt(博士, 0);

然后填充组合框:)

希望对您有所帮助

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