我希望能够使用列表视图更新数据库中的图像但我做不到文件上传总是给我一个空值并且无法解决问题任何人都可以帮助我成为 asp.net 的初学者和C＃
这是我的代码：
<body>
<form id="form1" runat="server">
<div>
<asp:Panel ID="Panel1" runat="server" Height="1138px">
<br />
<br />
<br />
<asp:Label ID="Label1" runat="server" Text="Articles" ForeColor="#FF3300"></asp:Label>
<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True"
DataSourceID="SqlDataSource1" DataTextField="Name" DataValueField="Name"
Height="16px" Width="267px">
</asp:DropDownList>
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:siteDBConnectionString %>"
SelectCommand="SELECT * FROM [Articles]"></asp:SqlDataSource>
<br />
<br />
<asp:ListView ID="ListView1" runat="server" DataKeyNames="Article_No"
DataSourceID="SqlDataSource2" GroupItemCount="3"
onselectedindexchanged="ListView1_SelectedIndexChanged">
<AlternatingItemTemplate>
<td runat="server" style="background-color: #FAFAD2;color: #284775;">
Name:
<asp:Label ID="NameLabel" runat="server"
Text='<%# Eval("Name") %>' />
<br />
Subject:
<asp:Label ID="SubjectLabel" runat="server" Text='<%# Eval("Subject") %>' />
<br />
Date:
<asp:Label ID="DateLabel" runat="server" Text='<%# Eval("Date") %>' />
<br />
Picture:
<asp:Label ID="PictureLabel" runat="server" Text='<%# Eval("Picture") %>' />
<br />
Content:
<asp:Label ID="ContentLabel" runat="server" Text='<%# Eval("Content") %>' />
<br />
Article_No:
<asp:Label ID="Article_NoLabel" runat="server"
Text='<%# Eval("Article_No") %>' />
<br />
<asp:Button ID="DeleteButton" runat="server" CommandName="Delete"
Text="Delete" />
<br />
<asp:Button ID="EditButton" runat="server" CommandName="Edit" Text="Edit" />
<br />
</td>
</AlternatingItemTemplate>
<EditItemTemplate>
<td runat="server" style="background-color: #FFCC66;color: #000080;">
Name:
<asp:TextBox ID="NameTextBox" runat="server"
Text='<%# Bind("Name", "{0}") %>' />
<br />
Subject:
<asp:TextBox ID="SubjectTextBox" runat="server"
Text='<%# Bind("Subject", "{0}") %>' />
<br />
Date:
<asp:TextBox ID="DateTextBox" runat="server"
Text='<%# Bind("Date", "{0:g}") %>' />
<br />
Picture:
<asp:FileUpload ID="fuimage" runat="server" />
<br />
Content:
<asp:TextBox ID="ContentTextBox" runat="server"
Text='<%# Bind("Content", "{0}") %>' TextMode="MultiLine" />
<br />
Article_No:
<asp:Label ID="Article_NoLabel1" runat="server" Enabled="False"
Text='<%# Eval("Article_No", "{0}") %>' />
<br />
<asp:Button ID="UpdateButton" runat="server" CommandName="Update"
OnClick="UpdateButton_Click1" Text="Update" />
<br />
<asp:Button ID="CancelButton" runat="server" CommandName="Cancel"
Text="Cancel" />
<br />
</td>
</EditItemTemplate>
<EmptyDataTemplate>
<table runat="server"
style="background-color: #FFFFFF;border-collapse: collapse;border-color: #999999;border-style:none;border-width:1px;">
<tr>
<td>
No data was returned.</td>
</tr>
</table>
</EmptyDataTemplate>
<EmptyItemTemplate>
<td runat="server" />
</EmptyItemTemplate>
<GroupTemplate>
<tr ID="itemPlaceholderContainer" runat="server">
<td ID="itemPlaceholder" runat="server">
</td>
</tr>
</GroupTemplate>
<InsertItemTemplate>
<td runat="server" style="">
Name:
<asp:TextBox ID="NameTextBox" runat="server" Text='<%# Bind("Name") %>' />
<br />
Subject:
<asp:TextBox ID="SubjectTextBox" runat="server" Text='<%# Bind("Subject") %>' />
<br />
Date:
<asp:TextBox ID="DateTextBox" runat="server" Text='<%# Bind("Date") %>' />
<br />
Picture:
<asp:TextBox ID="PictureTextBox" runat="server" Text='<%# Bind("Picture") %>' />
<br />
Content:
<asp:TextBox ID="ContentTextBox" runat="server" Text='<%# Bind("Content") %>' />
<br />
<asp:Button ID="InsertButton" runat="server" CommandName="Insert"
Text="Insert" />
<br />
<asp:Button ID="CancelButton" runat="server" CommandName="Cancel"
Text="Clear" />
<br />
</td>
</InsertItemTemplate>
<ItemTemplate>
<td runat="server" style="background-color: #FFFBD6;color: #333333;">
Name:
<asp:Label ID="NameLabel" runat="server"
Text='<%# Eval("Name") %>' />
<br />
Subject:
<asp:Label ID="SubjectLabel" runat="server" Text='<%# Eval("Subject") %>' />
<br />
Date:
<asp:Label ID="DateLabel" runat="server" Text='<%# Eval("Date") %>' />
<br />
Picture:
<asp:Label ID="PictureLabel" runat="server" Text='<%# Eval("Picture") %>' />
<br />
Content:
<asp:Label ID="ContentLabel" runat="server" Text='<%# Eval("Content") %>' />
<br />
Article_No:
<asp:Label ID="Article_NoLabel" runat="server"
Text='<%# Eval("Article_No") %>' />
<br />
<asp:Button ID="DeleteButton" runat="server" CommandName="Delete"
Text="Delete" />
<br />
<asp:Button ID="EditButton" runat="server" CommandName="Edit" Text="Edit" />
<br />
</td>
</ItemTemplate>
<LayoutTemplate>
<table runat="server">
<tr runat="server">
<td runat="server">
<table ID="groupPlaceholderContainer" runat="server" border="1"
style="background-color: #FFFFFF;border-collapse: collapse;border-color: #999999;border-style:none;border-width:1px;font-family: Verdana, Arial, Helvetica, sans-serif;">
<tr ID="groupPlaceholder" runat="server">
</tr>
</table>
</td>
</tr>
<tr runat="server">
<td runat="server"
style="text-align: center;background-color: #FFCC66;font-family: Verdana, Arial, Helvetica, sans-serif;color: #333333;">
<asp:DataPager ID="DataPager2" runat="server" PageSize="12">
<Fields>
<asp:NextPreviousPagerField ButtonType="Button" ShowFirstPageButton="True"
ShowLastPageButton="True" />
</Fields>
</asp:DataPager>
</td>
</tr>
</table>
</LayoutTemplate>
<SelectedItemTemplate>
<td runat="server"
style="background-color: #FFCC66;font-weight: bold;color: #000080;">
Name:
<asp:Label ID="NameLabel" runat="server"
Text='<%# Eval("Name") %>' />
<br />
Subject:
<asp:Label ID="SubjectLabel" runat="server" Text='<%# Eval("Subject") %>' />
<br />
Date:
<asp:Label ID="DateLabel" runat="server" Text='<%# Eval("Date") %>' />
<br />
Picture:
<asp:Label ID="PictureLabel" runat="server" Text='<%# Eval("Picture") %>' />
<br />
Content:
<asp:Label ID="ContentLabel" runat="server" Text='<%# Eval("Content") %>' />
<br />
Article_No:
<asp:Label ID="Article_NoLabel" runat="server"
Text='<%# Eval("Article_No") %>' />
<br />
<asp:Button ID="DeleteButton" runat="server" CommandName="Delete"
Text="Delete" />
<br />
<asp:Button ID="EditButton" runat="server" CommandName="Edit" Text="Edit" />
<br />
</td>
</SelectedItemTemplate>
</asp:ListView>
<asp:SqlDataSource ID="SqlDataSource2" runat="server"
ConnectionString="<%$ ConnectionStrings:siteDBConnectionString %>"
DeleteCommand="DELETE FROM [Articles] WHERE [Article_No] = @Article_No"
InsertCommand="INSERT INTO [Articles] ([Name], [Subject], [Date], [Picture], [Content]) VALUES (@Name, @Subject, @Date, @Picture, @Content)"
SelectCommand="SELECT [Name], [Subject], [Date], [Picture], [Content], [Article_No] FROM [Articles] WHERE ([Name] = @Name)"
UpdateCommand="UPDATE [Articles] SET [Name] = @Name, [Subject] = @Subject, [Date] = @Date, [Picture] = @Picture, [Content] = @Content WHERE [Article_No] = @Article_No">
<DeleteParameters>
<asp:Parameter Name="Article_No" Type="Int32" />
</DeleteParameters>
<InsertParameters>
<asp:Parameter Name="Name" Type="String" />
<asp:Parameter Name="Subject" Type="String" />
<asp:Parameter Name="Date" Type="DateTime" />
<asp:Parameter Name="Picture" Type="String" />
<asp:Parameter Name="Content" Type="String" />
</InsertParameters>
<SelectParameters>
<asp:ControlParameter ControlID="DropDownList1" Name="Name"
PropertyName="SelectedValue" Type="String" />
</SelectParameters>
<UpdateParameters>
<asp:Parameter Name="Name" Type="String" />
<asp:Parameter Name="Subject" Type="String" />
<asp:Parameter Name="Date" Type="DateTime" />
<asp:Parameter Name="Picture" Type="String" />
<asp:Parameter Name="Content" Type="String" />
<asp:Parameter Name="Article_No" Type="Int32" />
</UpdateParameters>
</asp:SqlDataSource>
<br />
<br />
<br />
</asp:Panel>
</div>
</form>
这是我放的代码：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.IO;
using System.Data.SqlClient;
namespace WebApplication2
{
public partial class WebForm4 : System.Web.UI.Page
{
SqlConnection cnn = new SqlConnection(@"Data Source=.\SQLEXPRESS;AttachDbFilename=C:\Documents and Settings\Moeman\My Documents\siteDB.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True");
protected void Page_Load(object sender, EventArgs e)
{
}
protected void DateTextBox_TextChanged(object sender, EventArgs e)
{
}
protected void ListView1_SelectedIndexChanged(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
}
protected void UpdateButton_Click1(object sender, EventArgs e)
{
FileUpload fuimage = (FileUpload)ListView1.FindControl("fuimage");
String fupload = fuimage.FileName;
if (fuimage != null && fuimage.HasFile)
{
fuimage.SaveAs(Server.MapPath("~\\Images\\" + fupload.Trim()));
string path = "~\\Images\\" + fupload.Trim();
cnn.Open();
SqlCommand cmd = new SqlCommand("update Articles set Picture=@Picture ", cnn);
if (fuimage.HasFile)
{
cmd.Parameters.AddWithValue("@Picture", path);
}
else
{
cmd.Parameters.AddWithValue("@Picture", "");
}
cmd.ExecuteNonQuery();
cnn.Close();
}
}
}
}