我有一个5列10行的DataTable。现在,我想要向DataTable添加一个新列,并将DropDownList值分配给新列。因此,应该将新值添加10次到DropDownList列。该怎么做呢?注意:不使用FOR循环。
例如:我现有的DataTable是这样的。
ID Value
----- -------
1 100
2 150
现在,我想向此DataTable添加一个新列"CourseID“。我有一个DropDownList。它选择的值是1,所以我现有的Table应该如下所示:
ID Value CourseID
----- ------ ----------
1 100 1
2 150 1
该怎么做呢?
发布于 2011-06-21 22:34:07
如果不使用For循环:
Dim newColumn As New Data.DataColumn("Foo", GetType(System.String))
newColumn.DefaultValue = "Your DropDownList value"
table.Columns.Add(newColumn)
C#:
System.Data.DataColumn newColumn = new System.Data.DataColumn("Foo", typeof(System.String));
newColumn.DefaultValue = "Your DropDownList value";
table.Columns.Add(newColumn);
发布于 2011-06-21 22:29:12
添加列并更新DataTable
中的所有行,例如:
DataTable tbl = new DataTable();
tbl.Columns.Add(new DataColumn("ID", typeof(Int32)));
tbl.Columns.Add(new DataColumn("Name", typeof(string)));
for (Int32 i = 1; i <= 10; i++) {
DataRow row = tbl.NewRow();
row["ID"] = i;
row["Name"] = i + ". row";
tbl.Rows.Add(row);
}
DataColumn newCol = new DataColumn("NewColumn", typeof(string));
newCol.AllowDBNull = true;
tbl.Columns.Add(newCol);
foreach (DataRow row in tbl.Rows) {
row["NewColumn"] = "You DropDownList value";
}
//if you don't want to allow null-values'
newCol.AllowDBNull = false;
发布于 2017-11-03 20:17:31
//Data Table
protected DataTable tblDynamic
{
get
{
return (DataTable)ViewState["tblDynamic"];
}
set
{
ViewState["tblDynamic"] = value;
}
}
//DynamicReport_GetUserType() function for getting data from DB
System.Data.DataSet ds = manage.DynamicReport_GetUserType();
tblDynamic = ds.Tables[13];
//Add Column as "TypeName"
tblDynamic.Columns.Add(new DataColumn("TypeName", typeof(string)));
//fill column data against ds.Tables[13]
for (int i = 0; i < tblDynamic.Rows.Count; i++)
{
if (tblDynamic.Rows[i]["Type"].ToString()=="A")
{
tblDynamic.Rows[i]["TypeName"] = "Apple";
}
if (tblDynamic.Rows[i]["Type"].ToString() == "B")
{
tblDynamic.Rows[i]["TypeName"] = "Ball";
}
if (tblDynamic.Rows[i]["Type"].ToString() == "C")
{
tblDynamic.Rows[i]["TypeName"] = "Cat";
}
if (tblDynamic.Rows[i]["Type"].ToString() == "D")
{
tblDynamic.Rows[i]["TypeName"] = "Dog;
}
}
https://stackoverflow.com/questions/6426828
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