[英]Custom Paging With LinqDataSource & Formview
我正在嘗試使用LinqDataSource的Selecting
事件為FormView過濾數據,但是我似乎無法正確地將其分頁。 我只能設法在FormView中顯示一條記錄,但分頁控件卻沒有顯示。 我在LinqDataSource Selecting
事件中具有以下代碼:
e.Arguments.StartRowIndex = 0;
e.Arguments.MaximumRows = 1;
var result = db.Personnels.AsQueryable();
if (!String.IsNullOrEmpty(txtFirstName.Text))
{
result = result.Where(r => r.First_Name.Contains(txtFirstName.Text));
}
if (!String.IsNullOrEmpty(txtLastName.Text))
{
result = result.Where(r => r.Last_Name.Contains(txtLastName.Text));
}
e.Arguments.TotalRowCount = result.Count();
e.Result = result.Skip(fvMain.PageIndex).Take(1);
如上所述,此代碼有效,但是僅顯示一條記錄,並且分頁控件未顯示在FormView上。 我也嘗試使用以下方法修改e.Result
,但是我得到的Object reference not set to an instance of an object.
例外:
e.Result = result;
使用LinqDataSource的selecting事件分頁FormView的正確方法是什么?
編輯1
根據要求,這是FormView和LinqDataSource的標記:
<asp:FormView ID="fvMain" runat="server" CssClass="full"
DataKeyNames="Worker_ID" DataSourceID="ldsMain" DefaultMode="Edit"
AllowPaging="True" onitemupdating="fvMain_ItemUpdating">
<EditItemTemplate>
<table class="pad5 full">
<tr>
<td class="field-name" style="width: 100px">Worker ID:</td>
<td style="width: 80px"><asp:TextBox ID="txtWorkerID" runat="server" Text='<%#Eval("Worker_ID") %>' ReadOnly="true" style="width: 75px" /></td>
<td class="right"><input type="button" value="Injuries/LTA/WCB for this Person" onclick="openModalColorbox('Injuries.aspx?id='+$('#plcMain_fvMain_txtWorkerID').val(), 'Injuries')" /></td>
</tr>
</table>
<table class="pad5 full">
<tr>
<td class="field-name">Type Of Person:</td>
<td colspan="3">
<cc1:DataBindDropDownList ID="cboTypeOfPerson" runat="server"
AppendDataBoundItems="True" DataSourceID="ldsPersonTypes"
DataTextField="Type_of_Person" DataValueField="Type_of_Person"
SelectedValue='<%#Bind("Type_Of_Person") %>'>
<asp:ListItem Text="" Value="" />
</cc1:DataBindDropDownList>
<asp:LinqDataSource ID="ldsPersonTypes" runat="server"
ContextTypeName="PRIDE.PRIDEDataContext" EntityTypeName=""
OrderBy="Type_of_Person" TableName="Personnel_Types">
</asp:LinqDataSource>
</td>
</tr>
<tr>
<td class="field-name">Employee Number:</td>
<td><asp:TextBox ID="txtEmployeeNumber" runat="server" Text='<%#Bind("Employee_Number") %>' /></td>
<td class="field-name">SIN:</td>
<td><asp:TextBox ID="txtSIN" runat="server" Text='<%#Bind("SIN") %>' /></td>
</tr>
<tr>
<td class="field-name">Last Name:</td>
<td><asp:TextBox ID="txtLastName" runat="server" Text='<%#Bind("Last_Name") %>' /></td>
<td class="field-name">Previous Last Name:</td>
<td><asp:TextBox ID="txtPreviousLastName" runat="server" Text='<%#Bind("Previous_Last_Name") %>' /></td>
</tr>
<tr>
<td class="field-name">First Name:</td>
<td><asp:TextBox ID="txtFirstName" runat="server" Text='<%#Bind("First_Name") %>' /></td>
<td class="field-name">Marital Status:</td>
<td>
<cc1:DataBindDropDownList ID="DropDownList1" runat="server"
AppendDataBoundItems="True" SelectedValue='<%# Bind("Marital_Status") %>'
DataSourceID="ldsMaritalStatuses" DataTextField="Marital_Status"
DataValueField="Marital_Status">
<asp:ListItem Text="" Value="" />
</cc1:DataBindDropDownList>
<asp:LinqDataSource ID="ldsMaritalStatuses" runat="server"
ContextTypeName="PRIDE.PRIDEDataContext" EntityTypeName=""
OrderBy="Marital_Status" TableName="List____Employee__Marital_Status">
</asp:LinqDataSource>
</td>
</tr>
<tr>
<td class="field-name">Division:</td>
<td>
<cc1:DataBindDropDownList ID="cboDivision" runat="server"
AppendDataBoundItems="True" SelectedValue='<%# Bind("Division") %>'
DataSourceID="ldsDivisions" DataTextField="Division"
DataValueField="Division">
<asp:ListItem Text="" Value="" />
</cc1:DataBindDropDownList>
<asp:LinqDataSource ID="ldsDivisions" runat="server"
ContextTypeName="PRIDE.PRIDEDataContext" EntityTypeName="" GroupBy="Division"
OrderBy="Division" Select="new (key as Division, it as Areas)"
TableName="Areas">
</asp:LinqDataSource>
</td>
<td class="field-name">DOB:</td>
<td>
<asp:TextBox ID="txtDOB" runat="server" Text='<%#Bind("DOB", "{0:dd MMM yyyy}") %>' />
<asp:CalendarExtender ID="CalendarExtender1" runat="server" TargetControlID="txtDOB" Format="dd MMM yyyy" />
</td>
</tr>
<tr>
<td class="field-name">Department:</td>
<td>
<cc1:DataBindDropDownList ID="cboDepartment" runat="server"
AppendDataBoundItems="True" SelectedValue='<%# Bind("Department") %>'
DataSourceID="ldsDepartments" DataTextField="Department"
DataValueField="Department">
<asp:ListItem Text="" Value="" />
</cc1:DataBindDropDownList>
<asp:LinqDataSource ID="ldsDepartments" runat="server"
ContextTypeName="PRIDE.PRIDEDataContext" EntityTypeName="" GroupBy="Department"
OrderBy="Department" Select="new (key as Department, it as Areas)"
TableName="Areas">
</asp:LinqDataSource>
</td>
<td class="field-name">Terminated:</td>
<td>
<cc1:DataBindDropDownList ID="cboTerminated" runat="server"
SelectedValue='<%# Bind("Terminated") %>'>
<asp:ListItem Text="" Value="" />
<asp:ListItem Text="Yes" Value="Yes" />
<asp:ListItem Text="No" Value="No" />
</cc1:DataBindDropDownList>
</td>
</tr>
<tr>
<td class="field-name">Occupation:</td>
<td>
<cc1:DataBindDropDownList ID="cboOccupation" runat="server"
SelectedValue='<%# Bind("Occupation") %>' AppendDataBoundItems="True"
DataSourceID="ldsOccupations" DataTextField="Occupation"
DataValueField="Occupation">
<asp:ListItem Text="" Value="" />
</cc1:DataBindDropDownList>
<asp:LinqDataSource ID="ldsOccupations" runat="server"
ContextTypeName="PRIDE.PRIDEDataContext" EntityTypeName="" OrderBy="Occupation"
TableName="List____Employee__Occupations">
</asp:LinqDataSource>
</td>
<td class="field-name">Team:</td>
<td>
<cc1:DataBindDropDownList ID="cboTeam" runat="server"
SelectedValue='<%# Bind("Shift") %>' AppendDataBoundItems="True"
DataSourceID="ldsShifts" DataTextField="Shift"
DataValueField="Shift">
<asp:ListItem Text="" Value="" />
</cc1:DataBindDropDownList>
<asp:LinqDataSource ID="ldsShifts" runat="server"
ContextTypeName="PRIDE.PRIDEDataContext" EntityTypeName="" OrderBy="Shift"
TableName="List____Employee__Shifts">
</asp:LinqDataSource>
</td>
</tr>
<tr>
<td class="field-name">Lock Number:</td>
<td><asp:TextBox ID="txtLockNumber" runat="server" Text='<%#Bind("Lock_Number") %>' /></td>
<td class="field-name">Address:</td>
<td><asp:TextBox ID="txtAddress" runat="server" Text='<%#Bind("Address") %>' /></td>
</tr>
<tr>
<td class="field-name">City:</td>
<td><asp:TextBox ID="txtCity" runat="server" Text='<%#Bind("City") %>' /></td>
<td class="field-name">Company:</td>
<td><asp:TextBox ID="txtCompany" runat="server" Text='<%#Bind("Company") %>' /></td>
</tr>
<tr>
<td class="field-name">Province:</td>
<td><asp:TextBox ID="txtProvince" runat="server" Text='<%#Bind("Province") %>' /></td>
<td class="field-name">Company Contact:</td>
<td><asp:TextBox ID="txtCompanyContact" runat="server" Text='<%#Bind("Company_Contact") %>' /></td>
</tr>
<tr>
<td class="field-name">Postal:</td>
<td><asp:TextBox ID="txtPostal" runat="server" Text='<%#Bind("Postal") %>' /></td>
<td class="field-name">Phone:</td>
<td><asp:TextBox ID="txtPhone" runat="server" Text='<%#Bind("Phone") %>' /></td>
</tr>
<tr>
<td class="field-name">HCN:</td>
<td><asp:TextBox ID="txtHCN" runat="server" Text='<%#Bind("HCN") %>' /></td>
<td class="field-name">HCN Province:</td>
<td><asp:TextBox ID="txtHCNProvince" runat="server" Text='<%#Bind("HCN_Province") %>' /></td>
</tr>
<tr>
<td class="field-name">Comments:</td>
<td colspan="3">
<asp:TextBox ID="txtComments" runat="server" Text='<%#Bind("Comments") %>' TextMode="MultiLine" Rows="3" />
</td>
</tr>
</table>
<h2>H.R.I.S.</h2>
<table class="pad5 full">
<tr>
<td class="field-name">NOK Name:</td>
<td><asp:TextBox ID="txtNOKName" runat="server" Text='<%#Bind("NOK_Name") %>' /></td>
<td class="field-name">NOK Relation:</td>
<td>
<cc1:DataBindDropDownList ID="cboNOKRelation" runat="server"
SelectedValue='<%# Bind("NOK_Relation") %>' AppendDataBoundItems="True"
DataSourceID="ldsNOKRelations" DataTextField="Relationship"
DataValueField="Relationship">
<asp:ListItem Text="" Value="" />
</cc1:DataBindDropDownList>
<asp:LinqDataSource ID="ldsNOKRelations" runat="server"
ContextTypeName="PRIDE.PRIDEDataContext" EntityTypeName=""
OrderBy="Relationship" TableName="List____Employee__Relations">
</asp:LinqDataSource>
</td>
</tr>
<tr>
<td class="field-name">NOK Address:</td>
<td><asp:TextBox ID="txtNOKAddress" runat="server" Text='<%#Bind("NOK_Address") %>' /></td>
<td class="field-name">NOK City:</td>
<td><asp:TextBox ID="txtNOKCity" runat="server" Text='<%#Bind("NOK_City") %>' /></td>
</tr>
<tr>
<td class="field-name">NOK Province:</td>
<td><asp:TextBox ID="txtNOKProvince" runat="server" Text='<%#Bind("NOK_Province") %>' /></td>
<td class="field-name">NOK Postal:</td>
<td><asp:TextBox ID="txtNOKPostal" runat="server" Text='<%#Bind("NOK_Postal") %>' /></td>
</tr>
<tr>
<td class="field-name">NOK Phone:</td>
<td><asp:TextBox ID="txtNOKPhone" runat="server" Text='<%#Bind("NOK_Phone") %>' /></td>
</tr>
</table>
<div class="center">
<asp:Button ID="btnSave" runat="server" Text="Save Changes"
onclick="btnSave_Click" />
</div>
</EditItemTemplate>
<PagerSettings Mode="NextPreviousFirstLast"
FirstPageText="&lt;&lt; First" LastPageText="Last &gt;&gt;"
NextPageText="Next &gt;" PreviousPageText="&lt; Previous"
Position="TopAndBottom" />
<PagerStyle CssClass="pager" />
</asp:FormView>
<asp:LinqDataSource ID="ldsMain" runat="server"
ContextTypeName="PRIDE.PRIDEDataContext" EnableDelete="True"
EnableInsert="True" EnableUpdate="True" EntityTypeName=""
TableName="Personnels" onselecting="ldsMain_Selecting">
<UpdateParameters>
<asp:Parameter ConvertEmptyStringToNull="true" Name="Employee_Number" />
</UpdateParameters>
<InsertParameters>
<asp:Parameter ConvertEmptyStringToNull="true" Name="Employee_Number" />
</InsertParameters>
</asp:LinqDataSource>
從MSDN中,我們可以看到LinqDataSource
的AutoPage
屬性默認設置為true
。 從文檔:
當AutoPage屬性設置為true時,LinqDataSource控件僅檢索數據綁定控件中一頁的足夠記錄。 它使用
Skip<TSource>
和Take<TSource>
方法來檢索當前頁面的記錄。
所有這些的結果是,您需要更改一些內容才能使分頁工作。
e.Arguments.StartRowIndex = 0;
。 您不需要每次都這樣做,因為它會干擾分頁。 e.Result = result.Skip(fvMain.PageIndex).Take(1);
也沒有必要。 只是e.Result = result;
應該沒事。 我認為這兩件事的結合導致了您的問題。 但是,我們現在需要處理其中一個過濾器啟動的情況。
第一個問題是我們需要將以前應用的過濾器保留在ViewState中,否則我們將無法分辨何時應用了過濾器以及何時使用了現有過濾器。
啟發於將過濾器應用於連接到GridView的linqdatasource之后,單擊“編輯”使我回到舊數據 ,在頁面中添加一個屬性(您的姓氏將需要另一個):
public string FirstNameFilter
{
get
{
return (string)this.ViewState["FirstNameFilter"] ?? string.Empty;
}
set
{
this.ViewState["FirstNameFilter"] = value;
}
}
然后在您的Selecting
事件處理程序中,運行以下代碼:
var result = db.Personnels.AsQueryable();
if (!string.IsNullOrEmpty(txtFirstName.Text))
{
if (this.FirstNameFilter != txtFirstName.Text)
{
this.FirstNameFilter = txtFirstName.Text;
e.Arguments.StartRowIndex = 0;
}
if (!string.IsNullOrEmpty(this.FirstNameFilter))
{
result = result.Where(r => r.First_Name.Contains(txtFirstName.Text));
}
}
if (!string.IsNullOrEmpty(txtLastName.Text))
{
if (this.LastNameFilter != txtLastName.Text)
{
this.LastNameFilter = txtLastName.Text;
e.Arguments.StartRowIndex = 0;
}
if (!string.IsNullOrEmpty(this.LastNameFilter))
{
result = result.Where(r => r.First_Name.Contains(txtLastName.Text));
}
}
e.Arguments.TotalRowCount = result.Count();
e.Result = result;
我不確定為什么,但是我的問題通過將讀取e.Result = result...
的行更改為e.Result = result...
e.Result = result.Skip(0)
得以e.Result = result.Skip(0)
。 完成后,分頁可以完美地工作。
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