DataGrid常见关注问题解决方案

'VisualBasic
PrivateSubDataGrid1_UpdateCommand(ByValsourceAsObject,_
ByValeAsSystem.Web.UI.WebControls.DataGridCommandEventArgs)_
HandlesDataGrid1.UpdateCommand
DimdrAsDataset.BooksRow
'Getareferencetorowzero(wheretherowwasinserted)
dr=Me.DsBooks1.Books(0)
DimtbAsTextBox=CType(e.Item.Cells(2).Controls(0),TextBox)
dr.title=tb.Text
DimcbAsCheckBox=CType(e.Item.Cells(3).Controls(1),CheckBox)
dr.instock=cb.Checked
Me.SqlDataAdapter1.Update(Me.DsBooks1)
DataGrid1.EditItemIndex=-1
'Refreshthedatasetfromthedatabase
DsBooks1.Clear()
Me.SqlDataAdapter1.Fill(Me.DsBooks1)
'SavetherefresheddatasetinSessionstateagin
Session("DsBooks")=DsBooks1
DataGrid1.DataBind()
EndSub

//C#
privatevoidDataGrid1_UpdateCommand(objectsource,
System.Web.UI.WebControls.DataGridCommandEventArgse)
{
dsBooks.BooksRowdr;
//Getareferencetorowzero(wheretherowwasinserted)
dr=this.dsBooks1.Books[0];
TextBoxtb1=(TextBox)e.Item.Cells[2].Controls[0];
dr.title=tb1.Text;
CheckBoxcb=(CheckBox)e.Item.Cells[3].Controls[1];
dr.instock=cb.Checked;
this.sqlDataAdapter1.Update(this.dsBooks1);
DataGrid1.EditItemIndex=-1;
//Refreshthedatasetfromthedatabase
dsBooks1.Clear();
this.sqlDataAdapter1.Fill(this.dsBooks1);
//SavetherefresheddatasetinSessionstateagin
Session["DsBooks"]=dsBooks1;
DataGrid1.DataBind();
}

DisplayingaDrop-DownListinEditMode

StaticItems

<asp:TemplateColumnHeaderText="genre">
<ItemTemplate>
<asp:Labelid=Label4runat="server"
Text='<%#DataBinder.Eval(Container,"DataItem.genre")%>'>
</asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:DropDownListid="DropDownList2"runat="server"Width="172px">
[code]<asp:ListItemValue="fiction">fiction</asp:ListItem>[/b]

<asp:ListItemValue="biography">biography</asp:ListItem>[/b]

<asp:ListItemValue="reference">reference</asp:ListItem>[/b]

Dataset

<asp:TemplateColumnHeaderText="genre(dataset)">
<ItemTemplate>
<asp:Labelid=Label3runat="server"
Text='<%#DataBinder.Eval(Container,"DataItem.genre")%>'>
</asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:DropDownListid=DropDownList4runat="server"
DataSource="<%#DsBooks1%>"DataMember="Genre"
DataTextField="genre"DataValueField="genre"Width="160px">
</asp:DropDownList>
</EditItemTemplate>
</asp:TemplateColumn>

DataReader

Select*fromGenres

'VisualBasic
PublicFunctionGetGenreTable()AsDataTable
DimdtGenreAsDataTable=NewDataTable()
IfApplication("GenreTable")IsNothingThen
DimdrAsDataRow
DimdcAsNewDataColumn("genre")
dtGenre.Columns.Add(dc)
Me.SqlConnection1.Open()
DimdreaderAsSqlClient.SqlDataReader=_
Me.SqlCommand1.ExecuteReader()
Whiledreader.Read()
dr=dtGenre.NewRow()
dr(0)=dreader(0)
dtGenre.Rows.Add(dr)
EndWhile
Me.SqlConnection1.Close()
Else
dtGenre=CType(Application("GenreTable"),DataTable)
EndIf
ReturndtGenre
EndFunction

//C#
publicDataTableGetGenreTable()
{
DataTabledtGenre=newDataTable();
if(Application["GenreTable"]==null)
{
DataRowdr;
DataColumndc=newDataColumn("genre");
dtGenre.Columns.Add(dc);
this.sqlConnection1.Open();
System.Data.SqlClient.SqlDataReaderdreader=
this.sqlCommand1.ExecuteReader();
while(dreader.Read())
{
dr=dtGenre.NewRow();
dr[0]=dreader[0];
dtGenre.Rows.Add(dr);
}
this.sqlConnection1.Close();
}
else
{
dtGenre=(DataTable)Application["GenreTable"];
}
returndtGenre;
}

<asp:TemplateColumnHeaderText="genre(database)">
<ItemTemplate>
<asp:Labelid=Label1runat="server"
Text='<%#DataBinder.Eval(Container,"DataItem.genre")%>'>
</asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:DropDownListid=DropDownList1runat="server"
[code]DataSource="<%#GetGenreTable()%>"[/b]

PreselectinganItemintheDrop-DownList

'VisualBasic
PrivateSubDataGrid1_ItemDataBound(ByValsenderAsObject,_
ByValeAsSystem.Web.UI.WebControls.DataGridItemEventArgs)_
HandlesDataGrid1.ItemDataBound
Ife.Item.ItemType=ListItemType.EditItemThen
DimdrvAsDataRowView=CType(e.Item.DataItem,DataRowView)
DimcurrentgenreAsString=CType(drv("genre"),String)
DimddlAsDropDownList
ddl=CType(e.Item.FindControl("DropDownList1"),DropDownList)
ddl.SelectedIndex=ddl.Items.IndexOf(ddl.Items.FindByText(currentgenre))
EndIf
EndSub

//C#
privatevoidDataGrid1_ItemDataBound(objectsender,
System.Web.UI.WebControls.DataGridItemEventArgse)
{
if(e.Item.ItemType==ListItemType.EditItem){
DataRowViewdrv=(DataRowView)e.Item.DataItem;
Stringcurrentgenre=drv["genre"].ToString();
DropDownListddl=
(DropDownList)e.Item.FindControl("DropDownList1");
ddl.SelectedIndex=
ddl.Items.IndexOf(ddl.Items.FindByText(currentgenre));
}
}

SelectingMultipleItemsUsingaCheckBox(HotmailModel)

'VisualBasic
PrivateSubbtnDelete_Click(ByValsenderAsSystem.Object,_
ByValeAsSystem.EventArgs)HandlesbtnDelete.Click
'Walkthegridlookingforselectedrows
DimiAsInteger=0
DimcbAsCheckBox
DimdgiAsDataGridItem
DimbookidAsInteger
DimdrAsdsBooks.BooksRow
ForEachdgiInDataGrid1.Items
cb=CType(dgi.Cells(0).Controls(1),CheckBox)
Ifcb.CheckedThen
'Determinethekeyoftheselectedrecord...
bookid=CType(DataGrid1.DataKeys(i),Integer)
'...getapointertothecorrespondingdatasetrecord...
dr=Me.DsBooks1.Books.FindBybookid(bookid)
'...anddeleteit.
dr.Delete()
EndIf
i+=1
Next
Me.SqlDataAdapter1.Update(DsBooks1)
Me.SqlDataAdapter1.Fill(DsBooks1)
DataGrid1.DataBind()
EndSub

//C#
privatevoidbtnDelete_Click(objectsender,System.EventArgse)
{
inti=0;
CheckBoxcb;
intbookid;
dsBooks.BooksRowdr;
foreach(DataGridItemdgiinthis.DataGrid1.Items)
{
cb=(CheckBox)dgi.Cells[0].Controls[1];
if(cb.Checked)
{
//Determinethekeyoftheselectedrecord...
bookid=(int)DataGrid1.DataKeys[i];
//...getapointertothecorrespondingdatasetrecord...
dr=this.dsBooks1.Books.FindBybookid(bookid);
//...anddeleteit.
dr.Delete();
}
i++;
}
this.sqlDataAdapter1.Update(this.dsBooks1);
this.sqlDataAdapter1.Fill(this.dsBooks1);
DataGrid1.DataBind();
}

EditingMultipleRowsAtOnce

DataBinder.Eval(Container,"DataItem.title")

'VisualBasic
PrivateSubbtnUpdate_Click(ByValsenderAsSystem.Object,_
ByValeAsSystem.EventArgs)HandlesbtnUpdate.Click
DimiAsInteger
DimdgiAsDataGridItem
DimbookidAsInteger
DimTextBoxTitleAsTextBox
DimCheckBoxInStockAsCheckBox
DimTextBoxPriceAsTextBox
DimLabelBookIdasLabel

Fori=0ToDataGrid1.Items.Count-1
dgi=DataGrid1.Items(i)
LabelBookId=CType(dgi.Cells(0).Controls(1),Label)
bookid=CType(LabelBookId.Text,Integer)
TextBoxTitle=CType(dgi.FindControl("TextBoxTitle"),TextBox)
CheckBoxInStock=_
CType(dgi.FindControl("CheckBoxInstock"),CheckBox)
TextBoxPrice=CType(dgi.FindControl("TextBoxPrice"),TextBox)
Me.dcmdUpdateBooks.Parameters("@bookid").Value=bookid
Me.dcmdUpdateBooks.Parameters("@Title").Value=TextBoxTitle.Text
Me.dcmdUpdateBooks.Parameters("@instock").Value=_
CheckBoxInStock.Checked
Me.dcmdUpdateBooks.Parameters("@Price").Value=TextBoxPrice.Text
Me.SqlConnection1.Open()
Me.dcmdUpdateBooks.ExecuteNonQuery()
Me.SqlConnection1.Close()
Next
EndSub

//C#
privatevoidbtnUpdate_Click(objectsender,System.EventArgse)
{
inti;
DataGridItemdgi;
intbookid;
TextBoxTextBoxTitle;
CheckBoxCheckBoxInStock;
TextBoxTextBoxPrice;

for(i=0;i<=DataGrid1.Items.Count-1;i++)
{
dgi=DataGrid1.Items[i];
LabelLabelBookId=(Label)dgi.Cells[0].Controls[1];
bookid=int.Parse(LabelBookId.Text);
TextBoxTitle=(TextBox)dgi.FindControl("TextBoxTitle");
CheckBoxInStock=(CheckBox)dgi.FindControl("CheckBoxInStock");
TextBoxPrice=(TextBox)dgi.FindControl("TextBoxPrice");
this.dcmdUpdateBooks.Parameters["@bookid"].Value=bookid;
this.dcmdUpdateBooks.Parameters["@Title"].Value=TextBoxTitle.Text;
this.dcmdUpdateBooks.Parameters["@instock"].Value=
CheckBoxInStock.Checked;
this.dcmdUpdateBooks.Parameters["@Price"].Value=
float.Parse(TextBoxPrice.Text);
this.sqlConnection1.Open();
this.dcmdUpdateBooks.ExecuteNonQuery();
this.sqlConnection1.Close();
}
}

'VisualBasic
ProtectedbookidlistAsArrayList=NewArrayList()

//C#
protectedArrayListbookidlist=newArrayList();

'VisualBasic
ProtectedSubRowChanged(ByValsenderAsObject,_
ByValeAsSystem.EventArgs)
DimdgiAsDataGridItem=_
CType(CType(sender,Control).NamingContainer,DataGridItem)
DimbookidlabelAsLabel=CType(dgi.Cells(0).Controls(1),Label)
DimbookidAsInteger=CType(bookidlabel.Text,Integer)
IfNot(bookidlist.Contains(bookid))Then
bookidlist.Add(bookid)
EndIf
EndSub

//C#
protectedvoidRowChanged(objectsender,System.EventArgse)
{
DataGridItemdgi=(DataGridItem)(((Control)sender).NamingContainer);
Labelbookidlabel=(Label)dgi.Cells[0].Controls[1];
intbookid=int.Parse(bookidlabel.Text);
if(!bookidlist.Contains(bookid))
{
bookidlist.Add(bookid);
}
}

sender

btnUpdate_Click

btnUpdate_Click

'VisualBasic
PrivateSubbtnUpdate_Click(ByValsenderAsSystem.Object,_
ByValeAsSystem.EventArgs)HandlesbtnUpdate.Click
DimiAsInteger
DimdgiAsDataGridItem
'Restofdeclarationshere

Fori=0ToDataGrid1.Items.Count-1
dgi=DataGrid1.Items(i)
LabelBookId=CType(dgi.Cells(0).Controls(1),Label)
[code]Ifbookidlist.Contains(bookid)Then[/b]

EndIf[/b]

if(bookidlist.Contains(bookid))[/b]

{[/b]

}[/b]

<asp:TemplateColumnHeaderText="title">
<ItemTemplate>
<asp:TextBox[code]OnTextChanged="RowChanged"[/b]

OnCheckedChanged="RowChanged"[/b]

'VisualBasic
PrivateSubDataGrid1_ItemDataBound(ByValsenderAsObject,_
ByValeAsSystem.Web.UI.WebControls.DataGridItemEventArgs)_
HandlesDataGrid1.ItemDataBound
DimitemTypeAsListItemType=e.Item.ItemType
If((itemType=ListItemType.Pager)Or_
(itemType=ListItemType.Header)Or_
(itemType=ListItemType.Footer))Then
Return
Else
DimbuttonAsLinkButton=_
CType(e.Item.Cells(0).Controls(0),LinkButton)
e.Item.Attributes("onclick")=_
Page.GetPostBackClientHyperlink(button,"")
EndIf
EndSub

//C#
privatevoidDataGrid1_ItemDataBound(objectsender,
System.Web.UI.WebControls.DataGridItemEventArgse)
{
ListItemTypeitemType=e.Item.ItemType;
if((itemType==ListItemType.Pager)||
(itemType==ListItemType.Header)||
(itemType==ListItemType.Footer))
{
return;
}
LinkButtonbutton=(LinkButton)e.Item.Cells[0].Controls[0];
e.Item.Attributes["onclick"]=
Page.GetPostBackClientHyperlink(button,"");
}

出自MSDN:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dv_vstechart/html/vbtchTopQuestionsAboutASPNETDataGridServerControl.asp