标签显示GridView中显示的数据源中的行总数

我已经在试图找出这个问题时达到了一个静止的意义。因此，我的Web应用程序具有一个列表列表，可以填充网格视图。然后，在GridView下方的标签中，应该为所选作者显示数据库中的所有行(此Web应用程序将使用分页(。每当我选择其他作者时，我的标签都会抛出一些疯狂的价值观。我需要在代码中进行调整是什么？

CSS代码：

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="Homemade01.WebForm1" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Welcome to our Master/Detail Filtering with a DropDownList example</title>
<style type="text/css">
    .auto-style1 {
        font-size: xx-large;
    }
    .auto-style2 {
        color: #FF0000;
    }
</style>
</head>
<body>
<form id="form1" runat="server">
<div>
    <span class="auto-style1">Welcome to our Master/Detail Filtering with a DropDownList example:</span><br />
    <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:ConnectionString %>" ProviderName="<%$ ConnectionStrings:ConnectionString.ProviderName %>" SelectCommand="SELECT firstName + '  ' + lastName AS FullName, lastName, authorID, firstName FROM Authors ORDER BY lastName, authorID"></asp:SqlDataSource>
    <br />
    Please select an author from the list:&nbsp;
    <asp:DropDownList ID="DropDownList1" runat="server" DataSourceID="SqlDataSource1" Height="16px" Width="248px" AutoPostBack="True" DataTextField="FullName" DataValueField="authorID">
    </asp:DropDownList>
    <br />
    <br />
    <asp:SqlDataSource ID="SqlDataSource2" runat="server" ConnectionString="<%$ ConnectionStrings:ConnectionString %>" ProviderName="<%$ ConnectionStrings:ConnectionString.ProviderName %>" SelectCommand="SELECT Authors.firstName, Authors.lastName, AuthorISBN.ISBN, Titles.title, Publishers.publisherName, Titles.price, Titles.editionNumber FROM (((Authors INNER JOIN AuthorISBN ON Authors.authorID = AuthorISBN.authorID) INNER JOIN Titles ON AuthorISBN.ISBN = Titles.ISBN) INNER JOIN Publishers ON Titles.publisherID = Publishers.publisherID) WHERE (Authors.authorID = ?)">
        <SelectParameters>
            <asp:ControlParameter ControlID="DropDownList1" Name="?" PropertyName="SelectedValue" />
        </SelectParameters>
    </asp:SqlDataSource>
    <br />
    <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataSourceID="SqlDataSource2" AllowPaging="True" AllowSorting="True" CellPadding="4" ForeColor="#333333" GridLines="None" >
        <AlternatingRowStyle BackColor="White" />
        <Columns>
            <asp:BoundField DataField="firstName" HeaderText="First Name" SortExpression="firstName" />
            <asp:BoundField DataField="lastName" HeaderText="Last Name" SortExpression="lastName" />
            <asp:BoundField DataField="ISBN" HeaderText="ISBN" SortExpression="ISBN" />
            <asp:BoundField DataField="title" HeaderText="Title" SortExpression="title" />
            <asp:BoundField DataField="publisherName" HeaderText="Publisher" SortExpression="publisherName" />
            <asp:BoundField DataField="price" HeaderText="Price" SortExpression="price" DataFormatString="{0:c}" >
            <ItemStyle HorizontalAlign="Right" />
            </asp:BoundField>
            <asp:BoundField DataField="editionNumber" HeaderText="Edition" SortExpression="editionNumber" >
            <ItemStyle HorizontalAlign="Right" />
            </asp:BoundField>
        </Columns>
        <FooterStyle BackColor="#990000" Font-Bold="True" ForeColor="White" />
        <HeaderStyle BackColor="#990000" Font-Bold="True" ForeColor="White" />
        <PagerStyle BackColor="#FFCC66" ForeColor="#333333" HorizontalAlign="Center" />
        <RowStyle BackColor="#FFFBD6" ForeColor="#333333" />
        <SelectedRowStyle BackColor="#FFCC66" Font-Bold="True" ForeColor="Navy" />
        <SortedAscendingCellStyle BackColor="#FDF5AC" />
        <SortedAscendingHeaderStyle BackColor="#4D0000" />
        <SortedDescendingCellStyle BackColor="#FCF6C0" />
        <SortedDescendingHeaderStyle BackColor="#820000" />
    </asp:GridView>
    <br />
    <br />
    <span class="auto-style2">The number of books is:</span>
    <asp:Label ID="Label1" runat="server" style="color: #FF0000"></asp:Label>
</div>
</form>

c＃代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Data;
namespace Homemade01
{
public partial class WebForm1 : System.Web.UI.Page
{

    protected void Page_Load(object sender, EventArgs e)
    {
        int rowCount = GridView1.Rows.Count;
        Label1.Text = "Books found: " + rowCount.ToString();
    }
}
}

我终于得到了纠正并正确运行。我可能已经对SQL数据源1进行了双重编码。我正在使用Visual Studio 2012，因此，如果有人在将来引用此帖子，请记住在您的SQL数据源中检查事件处理程序，而只需双击选定。

这是给我带来很多问题的原因，因为尽管选择的数据源是在我的C＃代码中，但在CSS代码中未参考。祝您将来有这个问题的其他人好运。这正确返回了结果。该网页应该显示在下拉列表中选择的作者的记录总数，无论您使用哪个页面。

这是CSS：

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" 
Inherits="Homemade01.WebForm1" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Welcome to our Master/Detail Filtering with a DropDownList example</title>
<style type="text/css">
    .auto-style1 {
        font-size: xx-large;
    }
</style>
</head>
<body>
<form id="form1" runat="server">
<div>
<span class="auto-style1">Welcome to our Master/Detail Filtering with a DropDownList example:</span><br />
    <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:ConnectionString %>" ProviderName="<%$ ConnectionStrings:ConnectionString.ProviderName %>" SelectCommand="SELECT firstName + '  ' + lastName AS FullName, lastName, authorID, firstName FROM Authors ORDER BY lastName, authorID" OnSelected="SqlDataSource1_Selected"  ></asp:SqlDataSource>
    <br />
    Please select an author from the list:&nbsp;
    <asp:DropDownList ID="DropDownList1" runat="server" DataSourceID="SqlDataSource1" Height="16px" Width="248px" AutoPostBack="True" DataTextField="FullName" DataValueField="authorID">
    </asp:DropDownList>
    <br />
    <br />
    <asp:SqlDataSource ID="SqlDataSource2" runat="server" ConnectionString="<%$ ConnectionStrings:ConnectionString %>" ProviderName="<%$ ConnectionStrings:ConnectionString.ProviderName %>" SelectCommand="SELECT Authors.firstName, Authors.lastName, AuthorISBN.ISBN, Titles.title, Publishers.publisherName, Titles.price, Titles.editionNumber FROM (((Authors INNER JOIN AuthorISBN ON Authors.authorID = AuthorISBN.authorID) INNER JOIN Titles ON AuthorISBN.ISBN = Titles.ISBN) INNER JOIN Publishers ON Titles.publisherID = Publishers.publisherID) WHERE (Authors.authorID = ?)" OnSelected="SqlDataSource2_Selected">
        <SelectParameters>
            <asp:ControlParameter ControlID="DropDownList1" Name="?" PropertyName="SelectedValue" />
        </SelectParameters>
    </asp:SqlDataSource>
    <br />
    <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataSourceID="SqlDataSource2" AllowPaging="True" AllowSorting="True" CellPadding="4" ForeColor="#333333" GridLines="None"  >
        <AlternatingRowStyle BackColor="White" />
        <Columns>
            <asp:BoundField DataField="firstName" HeaderText="First Name" SortExpression="firstName" />
            <asp:BoundField DataField="lastName" HeaderText="Last Name" SortExpression="lastName" />
            <asp:BoundField DataField="ISBN" HeaderText="ISBN" SortExpression="ISBN" />
            <asp:BoundField DataField="title" HeaderText="Title" SortExpression="title" />
            <asp:BoundField DataField="publisherName" HeaderText="Publisher" SortExpression="publisherName" />
            <asp:BoundField DataField="price" HeaderText="Price" SortExpression="price" DataFormatString="{0:c}" >
            <ItemStyle HorizontalAlign="Right" />
            </asp:BoundField>
            <asp:BoundField DataField="editionNumber" HeaderText="Edition" SortExpression="editionNumber" >
            <ItemStyle HorizontalAlign="Right" />
            </asp:BoundField>
        </Columns>
        <FooterStyle BackColor="#990000" Font-Bold="True" ForeColor="White" />
        <HeaderStyle BackColor="#990000" Font-Bold="True" ForeColor="White" />
        <PagerStyle BackColor="#FFCC66" ForeColor="#333333" HorizontalAlign="Center" />
        <RowStyle BackColor="#FFFBD6" ForeColor="#333333" />
        <SelectedRowStyle BackColor="#FFCC66" Font-Bold="True" ForeColor="Navy" />
        <SortedAscendingCellStyle BackColor="#FDF5AC" />
        <SortedAscendingHeaderStyle BackColor="#4D0000" />
        <SortedDescendingCellStyle BackColor="#FCF6C0" />
        <SortedDescendingHeaderStyle BackColor="#820000" />
    </asp:GridView>
    <br />
    <br />
    <asp:Label ID="Label1" runat="server" style="color: #FF0000"></asp:Label>
</div>
</form>

现在C＃代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Data;
namespace Homemade01
{
public partial class WebForm1 : System.Web.UI.Page
{
    //int rowCount;
    protected void Page_Load(object sender, EventArgs e)
    {
    }
    protected void SqlDataSource1_Selected(object sender, SqlDataSourceStatusEventArgs e)
    {
        //int rowCount = e.AffectedRows;
    }
    protected void SqlDataSource2_Selected(object sender, SqlDataSourceStatusEventArgs e)
    {
        int rowCount = e.AffectedRows; 
        //Above find the affected rows in SQL Data Source 2 and counts them then assigns them to an INT
        Label1.Text = "The number of Books found is: " + rowCount.ToString();
        //Label prints its text plus the rowCount variable which is converted to a string
    }
    }
   }

如果问题是要打印使用SQL数据源绑定到网格的记录总数或行的计数，那么您可以尝试将代码修改如下。

对于SQL数据源，一旦您从下拉列表中选择一个值后，就会发生另一个事件。如果您使用的是SQLDATASOURCE，则可以使用"选定"事件来计数总行，该事件在完成操作完成后发射。

protected void SqlDataSource1_Selected(object sender, SqlDataSourceStatusEventArgs e)
{
  int rowCount = e.AffectedRows;
}

可能您应该尝试将代码从page_load移动到上述事件。

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