GridView使用心得

1.ItemStyle-Wrap="False"
   按了Edit后，会出现Update和Cancel,列宽大了，居然给自动换行，这样就不好看了
  



2.传parameter的时候，DefaultValue=" "字符串中留有空格才行，如果是DefaultValue="",传进去的将是Nothing
<SelectParameters>
 <asp:ControlParemeter ControlID="Name" Name="Name" PropertyName="Text" Type="String" DefaultValue=" ">
...
<asp:Parameter Name="maxinumRows" Type="Int32">
<asp:Parameter Name="startRowIndex" Type="Int32">
<asp:Parameter Name="sortBy" Type="String" DefaultValue=" ">
</SelectParameters>
 
3.GridView1的隐藏列DataKeyNames="Id"
<asp:GridView ID="GridView1" runat="server" ... DataKeyNames="Id">
在后台可以使用GridView1.DataKeys(index).value来得到它

Protected Sub GridView1_RowCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewCommandEventArgs) Handles GridView1.RowCommand
  Select Case e.CommandName
      Case "Edit"
            Dim index as Int32=Convert.ToInt32(e.CommandArgument)
            Dim id as Integer=CInt(GridView1.DataKeys(index).value)
            ...
     Case "Update"
     Case "Delete"
     Case "Cancel"
   End Select
End Sub

3.给界面上的DropDown List或GridView指定数据源时，少使用 DataSourceID，尽量使用DataSource

 因为指定DataSourceID是自动绑定数据源，当用Jquery改变了里面的option选项，总会导致被ObjectDataSource覆盖

 甚至当GridView点Edit button,也会在后台自动调用

DataSourceID:

<asp:TemplateField HeaderText="test2" SortExpression="Lv2">
                <ItemTemplate>
                    <%# Eval("Lv2")%>
                </ItemTemplate>
                <EditItemTemplate>
                    <asp:dropdownlist ID="test2" width="148px" runat="server" Text='<%# Bind("Lv2") %>' DataSourceID="dsTest" DataTextField ="Info"  DataValueField ="Code">
                     </asp:dropdownlist>
                </EditItemTemplate>
                <ItemStyle Width="150px" />
</asp:TemplateField>

<asp:ObjectDataSource ID="dsTest" runat="server"  SelectMethod="getInitDT" TypeName="SettingPage">
      <SelectParameters>
             <asp:Parameter Name="ddl_type"  Type="Int32" DefaultValue="0" />
      </SelectParameters>
</asp:ObjectDataSource>

DataSource

<asp:TemplateField HeaderText="test1" SortExpression="Lv1" >
                <ItemTemplate>
                    <%# Eval("Lv1")%>
                </ItemTemplate>
                <EditItemTemplate>
                    <asp:dropdownlist ID="test1"  width="148px" runat="server" Text='<%# Bind("Lv1") %>'   DataSource = "<%#getInitDT(0)%>" DataTextField ="Info"  DataValueField ="Code">
                     </asp:dropdownlist>
                </EditItemTemplate>
                <ItemStyle Width="150px" />
            </asp:TemplateField>

test1.DataSource = getInitDT(0)

test1.DataBind()

4.指定排序列的Style

<asp:GridView>

     ...

	    <SortedAscendingCellStyle BackColor="White" />
            <SortedAscendingHeaderStyle  BackColor="White" ForeColor="Black" />
            <SortedDescendingCellStyle BackColor="Yellow" />
            <SortedDescendingHeaderStyle BackColor="Yellow" ForeColor="Black"  />
 </asp:GridView>

 

5.自動排序

   <asp:GridView ID="HistoryGridView" runat="server" AutoGenerateColumns="False"
        CellPadding="4" DataSourceID="ObjectDataSource" ForeColor="#333333"
        GridLines="None" AllowPaging="True" AllowSorting="True" Width="100%" 
        DataKeyNames="Id,Code" 
        onrowdatabound="HistoryGridView_RowDataBound" >
        <RowStyle BackColor="#EFF3FB" HorizontalAlign="Center" />
        <Columns>
            <asp:TemplateField ShowHeader="False">
                <ItemTemplate>
                    <asp:LinkButton ID="deleteLink" runat="server" Enabled="false" CausesValidation="False" OnClientClick="if(!this.disabled) return confirm('Are you sure to delete this record?')"
                        CommandArgument='<%# Container.DisplayIndex %>' Text="Delete" OnClick="deleteLink_Click"></asp:LinkButton>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:BoundField DataField="Name" HeaderText="Name" ReadOnly="True" SortExpression="Name"  />
            <asp:BoundField DataField="PeriodDate" HeaderText="Period" ReadOnly="True"
                SortExpression="PeriodDate" DataFormatString="{0:MM/yyyy}" />
            <asp:HyperLinkField Text="View" DataNavigateUrlFields="PeriodDate,Id" DataNavigateUrlFormatString="~/Leave/DownloadFile?d={0:yyyyMMdd}&e={1}&flag=false" />
            <asp:CommandField />
        </Columns>
        <FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
        <PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />
        <SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" />
        <HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
        <EditRowStyle BackColor="#2461BF" />
        <AlternatingRowStyle BackColor="White" />
    </asp:GridView>
    <asp:ObjectDataSource ID="ObjectDataSource" runat="server" 
        SelectCountMethod="GetHistoriesCount" 
        SelectMethod="GetHistories" TypeName="Common.BLL.TestBLL" 
        onselecting="HistoryObjectDataSource_Selecting" SortParameterName="SortExpression" >
        <SelectParameters>
            <asp:Parameter Name="IdList"/>
        </SelectParameters>
    </asp:ObjectDataSource>

7.另類排序

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        ResultGridView.Attributes.Add("Sort", "latestupdatedate desc")
            bind()
    End Sub

    Protected Sub ResultGridView_Sorting(ByVal sender As Object, ByVal e As GridViewSortEventArgs) Handles ResultGridView.Sorting
        ResultGridView.EditIndex = -1
        If ResultGridView.Attributes("Sort") = e.SortExpression + " desc" Then
            ResultGridView.Attributes("Sort") = e.SortExpression
        Else
            ResultGridView.Attributes("Sort") = e.SortExpression + " desc"
        End If
        bind()

    End Sub

  Dim dv As DataView = New DataView(dt)
  dv.Sort = ResultGridView.Attributes("Sort")
  ResultGridView.DataSource = dv

8.空data和page size

    <asp:GridView ID="HistoryGridView" runat="server" AutoGenerateColumns="False"
        CellPadding="4" DataSourceID="ObjectDataSource" ForeColor="#333333"
        GridLines="None" AllowPaging="True" AllowSorting="True" Width="100%"  EmptyDataText="Empty Data !"
        DataKeyNames="TransferPeriodDate,EmployerId" PageSize = "20" >
  ...
 </asp:GridView>