许多建议避免错误。




Drp.DataSources = ds;



而不是绑定整个数据集到Drp。只需绑定特定的表格。



喜欢 ds.Tables [sometablename];


Drp.DataTextField = ds.Tables [0] .Rows [i] [Empsap]。ToString（）;

Drp.DataValueField = ds.Tables [0] .Rows [i] [Empsap]。ToString（）;



在这里，您只需要指定特定的表列名称，而不是动态行值数据。< clear>






例如，如果你确定该表有列，假设费用然后将其绑定。

Many suggestion to avoiding error.


Drp.DataSources= ds;


Rather then binding whole dataset to Drp. just bind the specific table inside.

Like ds.Tables["sometablename"];


Drp.DataTextField = ds.Tables[0].Rows[i]["Empsap"].ToString();
Drp.DataValueField = ds.Tables[0].Rows[i]["Empsap"].ToString();


Here you just need to assign specific table column name rather then dynamic row value data.<clear>



For Example are if you're sure that table have column, suppose "Fees" then bind it with.

Drp.DataTextField = "Fees";

同样适用于DataValueField。



如果您不确定列名，那么只需从表中获取列名

Same holds true for DataValueField.

And If you aren't sure with the column name, then just fetch column name from table Like

Drp.DataTextField = dt.Tables[0].Columns[2].ColumnName

请 投票 和 接受答案 如果有帮助。

Please vote and Accept Answer if it Helped.

试试这个



DropDown列表ddl;

int i = 0;

foreach（grdmenu.Rows中的GridViewRow grdrow）

{

ddl =（DropDownList）grdmenu.Rows [grdrow.RowIndex] .FindControl（ddloffer）;

ddl.SelectedIndex = Convert.ToInt16（ds.Tables [0] .Rows [i] [提供]）;

ddl =（DropDownList）grdmenu.Rows [grdrow.RowIndex] .FindControl（ddloffers）;

ddl.SelectedIndex = Convert.ToInt16（ ds.Tables [0] .Rows [i] [OfferType]）;

i ++;

ddl.DataBind（）;

}

Try This

DropDownList ddl;
int i = 0;
foreach (GridViewRow grdrow in grdmenu.Rows)
{
ddl = (DropDownList)grdmenu.Rows[grdrow.RowIndex].FindControl("ddloffer");
ddl.SelectedIndex = Convert.ToInt16(ds.Tables[0].Rows[i]["Offer"]);
ddl = (DropDownList)grdmenu.Rows[grdrow.RowIndex].FindControl("ddloffers");
ddl.SelectedIndex = Convert.ToInt16(ds.Tables[0].Rows[i]["OfferType"]);
i++;
ddl.DataBind();
}

DropDownList ddl;

foreach（GridViewRow gvRow in gvProf.Rows）

{

ddl =（DropDownList）（gvRow.Cells [5] .FindControl（ddlDcode））;

ddl.DataSource = ds;

ddl.DataTextField = ds.Tables [0] .Columns [dis_name]。ToString（）;

ddl.DataValueField = ds。 Tables [0] .Columns [dis_code]。ToString（）;

ddl.DataBind（）;

}

DropDownList ddl;
foreach (GridViewRow gvRow in gvProf.Rows)
{
ddl = (DropDownList)(gvRow.Cells[5].FindControl("ddlDcode"));
ddl.DataSource = ds;
ddl.DataTextField = ds.Tables[0].Columns["dis_name"].ToString();
ddl.DataValueField = ds.Tables[0].Columns["dis_code"].ToString();
ddl.DataBind();
}