[英]bind gridview column dynamically from dynamic datatable in asp.net
我有一个网格视图,其中有10列。在10列中,我有5列的集合,分别命名为Ata,Hplan,Hosp,Other(这4个是checkboxfield),Othercolor(Boundfield)以及Alta,Hplan等。我想在用户下拉选择中添加5列或全部添加10 ..是否需要禁用gridview的viewstate?如何实现此目标..第二个问题是如何在行数据绑定事件期间动态绑定这些列。问题是我希望gridview列名重复,但是在数据表中我不能给出重复的列名。请帮助。
protected void Btnshow_Click(object sender, EventArgs e)
{
if (DropDownList1.SelectedIndex==1)
{
dtgridbind.Columns.AddRange(new DataColumn[10] { new DataColumn("1_ALta", typeof(bool)),new DataColumn("1_Hplan", typeof(bool)),
new DataColumn("1_Hosp",typeof(bool)),new DataColumn("1_other",typeof(bool)),new DataColumn("1_othercolor",typeof(string)),
new DataColumn("2_ALta", typeof(bool)),new DataColumn("2_Hplan", typeof(bool)),
new DataColumn("2_Hosp",typeof(bool)),new DataColumn("2_other",typeof(bool)),new DataColumn("2_othercolor",typeof(string))});
dtgridbind.Rows.Add(true, false, false, false, "N/A", false, true, false, false, "Red");
dtgridbind.Rows.Add(true, false, false, false, "N/A", false, true, false, false, "Red");
dtgridbind.Rows.Add(true, false, false, false, "N/A", false, true, false, false, "Red");
GridView1.DataSource = dtgridbind;
GridView1.DataBind();
// ViewState["modechange"] = 1;
}
else
{
dtgridbind.Columns.AddRange(new DataColumn[5] { new DataColumn("1_ALta", typeof(bool)),new DataColumn("1_Hplan", typeof(bool)),
new DataColumn("1_Hosp",typeof(bool)),new DataColumn("1_other",typeof(bool)),new DataColumn("1_othercolor",typeof(string))});
dtgridbind.Rows.Add(true, false, false, false, "N/A");
dtgridbind.Rows.Add(true, false, false, false, "N/A");
dtgridbind.Rows.Add(true, false, false, false, "Red");
// ViewState["grid"] = dtgridbind;
GridView1.DataSource = dtgridbind;
GridView1.DataBind();
}
}
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.Header)
{
foreach (DataColumn datacol in dtgridbind.Columns)
{
if (datacol.ColumnName.Contains("_othercolor"))
{
BoundField bfield = new BoundField();
bfield.HeaderText = datacol.ColumnName.Substring(2, datacol.ColumnName.Length - 2);
bfield.DataField = datacol.ColumnName;
GridView1.Columns.Add(bfield);
}
else
{
CheckBoxField ck = new CheckBoxField();
ck.HeaderText = datacol.ColumnName.Substring(2, datacol.ColumnName.Length - 2);
ck.DataField = datacol.ColumnName;
GridView1.Columns.Add(ck);
}
}
}
这段代码能满足您的要求吗? 在此代码中,有一个包含两个值的下拉列表。 如果选择了“ 10列”,它将回发并将10列添加到数据表中。 如果选择了“ 5列”,它将回发并将5列添加到数据表中。
在OnRowDataBound中,它循环遍历标题单元格,并根据“ _”字符拆分文本。 然后介绍第二部分。 仅当您遵循此列的命名约定时,这才起作用。
您不能有具有相同列名的数据列。 要解决此问题,您可以使用OnRowDataBound并如上所述更改单元格文本。
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<asp:DropDownList ID="DropDownList1" runat="server" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged" AutoPostBack="true">
<asp:ListItem Text="" Value =""></asp:ListItem>
<asp:ListItem Text="10 Columns" Value ="1"></asp:ListItem>
<asp:ListItem Text="5 Columns" Value ="2"></asp:ListItem>
</asp:DropDownList>
<asp:GridView runat="server" ID="GridView1" OnRowDataBound="GridView1_RowDataBound"></asp:GridView>
</form>
</body>
</html>
public partial class WebForm3 : System.Web.UI.Page
{
private DataTable dtgridbind = new DataTable();
protected void Page_Load(object sender, EventArgs e)
{
}
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.Header)
{
foreach (TableCell headerCell in e.Row.Cells)
{
headerCell.Text = headerCell.Text.Split('_')[1];
}
}
}
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
if (DropDownList1.SelectedIndex == 1)
{
dtgridbind.Columns.AddRange(new DataColumn[10] { new DataColumn("1_ALta", typeof(bool)),new DataColumn("1_Hplan", typeof(bool)),
new DataColumn("1_Hosp",typeof(bool)),new DataColumn("1_other",typeof(bool)),new DataColumn("1_othercolor",typeof(string)),
new DataColumn("2_ALta", typeof(bool)),new DataColumn("2_Hplan", typeof(bool)),
new DataColumn("2_Hosp",typeof(bool)),new DataColumn("2_other",typeof(bool)),new DataColumn("2_othercolor",typeof(string))});
dtgridbind.Rows.Add(true, false, false, false, "N/A", false, true, false, false, "Red");
dtgridbind.Rows.Add(true, false, false, false, "N/A", false, true, false, false, "Red");
dtgridbind.Rows.Add(true, false, false, false, "N/A", false, true, false, false, "Red");
GridView1.DataSource = dtgridbind;
GridView1.DataBind();
}
else
{
dtgridbind.Columns.AddRange(new DataColumn[5] { new DataColumn("1_ALta", typeof(bool)),new DataColumn("1_Hplan", typeof(bool)),
new DataColumn("1_Hosp",typeof(bool)),new DataColumn("1_other",typeof(bool)),new DataColumn("1_othercolor",typeof(string))});
dtgridbind.Rows.Add(true, false, false, false, "N/A");
dtgridbind.Rows.Add(true, false, false, false, "N/A");
dtgridbind.Rows.Add(true, false, false, false, "Red");
GridView1.DataSource = dtgridbind;
GridView1.DataBind();
}
}
}
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