c# - 编辑项目模板中的文件上传

标签 c# asp.net listview

我希望能够使用 ListView 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作为 asp.net 和 c# 的初学者

这是我的代码:

    <body>
    <form id="form1" runat="server">
    <div>

    <asp:Panel ID="Panel1" runat="server" Height="1138px">
        &nbsp;&nbsp;&nbsp;
        <br />
        <br />
        <br />
        &nbsp;&nbsp;&nbsp;
        <asp:Label ID="Label1" runat="server" Text="Articles" ForeColor="#FF3300"></asp:Label>
        &nbsp;<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>
        &nbsp;&nbsp;
        <br />
        <br />
        &nbsp;&nbsp;
        <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 />
        &nbsp;
        <br />
        <br />
    </asp:Panel>

</div>
</form>

这是我放置的代码:

    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();
        }
    }
}

}

最佳答案

使用ListView.EditItem而是找到您的 FileUpload 控件。

FileUpload fuimage = (FileUpload)ListView1.EditItem.FindControl("fuimage");

关于c# - 编辑项目模板中的文件上传，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/10020856/

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