Question

我在按钮中使用以下代码从gridview中删除一行：

int i = GridView1.SelectedIndex;
tshirtSet.Tables["tshirts"].Rows[i].Delete();
GridView1.DataSource = tshirtset;
GridView1.DataBind();
localhost.Service mc = new localhost.Service();

mc.GetTshirtSet();
mc.ModifyDatabase(tshirtSet); <-------(Error on this line)

gridview正在被链接到数据库的Web服务使用，此方法用于从我的数据库中检索数据

[WebMethod]
public DataSet GetTshirtSet()
{
    DataSet tshirtSet = new DataSet();
    string database = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=|DataDirectory|/shop.accdb;Persist Security Info=True";
    OleDbConnection myConn = new OleDbConnection(database);
    string queryStr = "SELECT * FROM tshirt";
    OleDbDataAdapter myDataAdapter = new OleDbDataAdapter(queryStr, myConn);
    myConn.Open();
    myDataAdapter.Fill(tshirtSet, "Tshirt");
    myConn.Close();
    return tshirtSet;
}

此方法也在webservice中，这基本上更新了数据库：

[WebMethod]
public string ModifyDatabase(DataSet myDataset)
{
    string database = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=|DataDirectory|/shop.accdb;Persist Security Info=True";
    OleDbConnection myConn = new OleDbConnection(database);
    OleDbDataAdapter myDataAdapter = new OleDbDataAdapter("Select * from tshirt", myConn);
    OleDbCommandBuilder builder = new OleDbCommandBuilder(myDataAdapter);
    builder.QuotePrefix = "[";
    builder.QuoteSuffix = "]";
    myConn.Open();
    myDataAdapter.Update(myDataset, "tshirt");
    myConn.Close();
    return "done";
}

这些是方法，我似乎无法删除一行，有什么建议吗？

System.Web.Services.Protocols.SoapException：服务器无法执行处理请求。 ---＆GT; System.InvalidOperationException：动态SQL 不支持针对DeleteCommand的生成 SelectCommand不返回任何键列信息。在 System.Data.Common.DbDataAdapter.UpdatingRowStatusErrors（RowUpdatingEventArgs rowUpdatedEvent，DataRow dataRow）at System.Data.Common.DbDataAdapter.Update（DataRow [] dataRows， DataTableMapping tableMapping）at System.Data.Common.DbDataAdapter.UpdateFromDataTable（数据表 dataTable，DataTableMapping tableMapping）at System.Data.Common.DbDataAdapter.Update（DataSet dataSet，String srcTable）在Service.ModifyDatabase（DataSet myDataset）中 e：\ web \ App_Code \ Service.cs：第183行---内部异常结束堆栈跟踪---

Answer 1

调用DataSet.AcceptChanges（）方法提交更改。

int i = GridView1.SelectedIndex;
tshirtSet.Tables["tshirts"].Rows[i].Delete();
tshirtSet.AcceptChanges();

Answer 2

protected void lnkDeleteRisk_onclick(object sender, EventArgs e)
{
        LinkButton obj_lnkbidtask = (LinkButton)sender;

        GridViewRow gvTask = (GridViewRow)obj_lnkbidtask.NamingContainer;

        HiddenField var_txtId (HiddenField)grdBidRisk.Rows[gvTask.RowIndex].Cells[0].FindControl("txtId");

        int int_ReturnVal = obj_WebService.DeleteRisk(var_txtId.Value);

        if (int_ReturnVal == -1)
        {
            lblErrMsg.Visible = true;
            lblErrMsg.Text = "Error occured during this operation, please contact administrator.";// "Authentication failed. Please try later.";
        }
        else
        {
            lblErrMsg.Visible = true;
            lblErrMsg.Text = "Selected risk deleted successfully.";
            SetInitialRow();
        }
    }

Answer 3

错误告诉您它无法从select语句中找出数据表的主键，因此当您调用{{1}时，dataadapter无法确定要传递给它创建的delete语句的内容}}

您的数据库表是否定义了主键？

删除gridview中的一行c＃

3 个答案: