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我目前有一个表单，其中有一个 DropDownList、一个 FileUpload 对象和一个用于提交 FileUpload 的按钮。DropDownList 连接到 SqlDataSource，它从我的数据库中的表中查询姓氏，因此 DropDownList 显示所述姓氏。我只是想知道是否可以上传附加到 DropDownList 中值的文件？如果有人想下载特定人上传的文件，以后可以使用它。我已经搜索了很长一段时间，还没有找到任何关于这方面的信息，所以任何帮助将不胜感激。这是我的表单代码：

<p>
    Choose student:</p>
<p>
    <asp:DropDownList ID="DropDownList1" runat="server" 
        DataSourceID="SqlDataSource1" DataTextField="stulastname" 
        DataValueField="stulastname">
    </asp:DropDownList>
    <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
        ConnectionString="<%$ ConnectionStrings:ConnectionString %>" 
        SelectCommand="SELECT [stulastname] FROM [application]"></asp:SqlDataSource>
</p>
<p>
    Leave comments:</p>
<p>
    <asp:TextBox ID="TextBox1" runat="server" Height="159px" Width="482px"></asp:TextBox>
</p>
<p>
    <asp:Button ID="Button2" runat="server" onclick="Button2_Click" 
        Text="Insert Comments" />
</p>
<p>
    Upload comments:</p>
<p>
    <asp:FileUpload ID="FileUpload1" runat="server" />
    <asp:RegularExpressionValidator id="FileUpLoadValidator" runat="server" ErrorMessage="Upload text documents only" ValidationExpression="^(([a-zA-Z]:)|(\\{2}\w+)\$?)(\\(\w[\w].*))(.txt|.doc)$" ControlToValidate="FileUpload1"></asp:RegularExpressionValidator>
</p>
<p>
    <asp:Button ID="Button1" runat="server" onclick="Button1_Click" 
        Text="Upload File" />
</p>

这是我当前的代码背后的代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Data.Sql;
using System.Data;
using System.IO;

public partial class PS_comments : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}

protected void Button1_Click(object sender, EventArgs e)
{
    if (FileUpload1.HasFile)
    {
        string FileName = FileUpload1.FileName;

        SqlConnection con = new SqlConnection("Data Source=.\\SQLEXPRESS;AttachDbFilename=E:\\Assignment\\App_Data\\MyDatabase.mdf;Integrated Security=True;User Instance=True");
        SqlCommand cmd;
        con.Open();
        con.Close();
        cmd = new SqlCommand("UPDATE application SET filename= '" + FileName + "' WHERE stulastname = '" + DropDownList1.SelectedValue + "' ");
        cmd.Connection = con;
        cmd.ExecuteNonQuery();
        string path = Server.MapPath("~/App_Data/userfiles");
        bool isExists = System.IO.Directory.Exists(path);
        if (!isExists)
            System.IO.Directory.CreateDirectory(path);
        var file = Path.Combine(path, FileUpload1.FileName);
        FileUpload1.SaveAs(file);
    }
}
protected void Button2_Click(object sender, EventArgs e)
{
    SqlConnection con = new SqlConnection("Data Source=.\\SQLEXPRESS;AttachDbFilename=E:\\Assignment\\App_Data\\MyDatabase.mdf;Integrated Security=True;User Instance=True");
    SqlCommand cmd;
    con.Open();
    cmd = new SqlCommand("UPDATE application SET comments = '" + TextBox1.Text + "' WHERE stulastname = '" + DropDownList1.SelectedValue + "' ");
    cmd.Connection = con;
    cmd.ExecuteNonQuery();
}
}
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3 回答 3

0 
protected void Button1_Click(object sender, EventArgs e)
    {
        if (FileUpload1.HasFile)
        {
            string FileName = FileUpload1.PostedFile.FileName;

            SqlConnection con = new SqlConnection(
                "Data Source=.\\SQLEXPRESS;
                 AttachDbFilename=E:\\Assignment\\App_Data\\MyDatabase.mdf;
                 Integrated Security=True;User Instance=True");
            SqlCommand cmd;
            con.Open();
            cmd = new SqlCommand("UPDATE application 
                                  SET filename= '" + FileName + "' 
                                  WHERE stulastname = '" + DropDownList1.SelectedValue + "' ");
            cmd.Connection = con;
            cmd.ExecuteNonQuery();
            string path = Server.MapPath("~/App_Data/userfiles");
            bool isExists = System.IO.Directory.Exists(path);
            if (!isExists)
                System.IO.Directory.CreateDirectory(path);
            var file = Path.Combine(path, FileUpload1.FileName);
            FileUpload1.SaveAs(file);
        }
    }
于 2013-10-31T11:05:05.790 回答
0

刚才我检查你的代码。请改变

字符串文件名 = FileUpload1.PostedFile.FileName;

至

字符串文件名 = 文件上传 1.文件名；请添加

con.Close();

后

cmd.ExecuteNonQuery();

如果下拉值不正确，它不会更新数据库。所以请检查 DropDownList1.SelectedValue 是否与 db 列值匹配

于 2013-11-01T08:08:10.590 回答
0

使用 System.IO；protected void Button1_Click(object sender, EventArgs e) { if (FileUpload1.HasFile) { string FileName = FileUpload1.PostedFile.FileName;

            SqlConnection con = new SqlConnection("Data Source=.\\SQLEXPRESS;AttachDbFilename=E:\\Assignment\\App_Data\\MyDatabase.mdf;Integrated Security=True;User Instance=True");
            SqlCommand cmd;
            con.Open();
            cmd = new SqlCommand("UPDATE application SET filename= '" + FileName + "' WHERE stulastname = '" + DropDownList1.SelectedValue + "' ");
            cmd.Connection = con;
            cmd.ExecuteNonQuery();
            string path = Server.MapPath("~/App_Data/userfiles");
            bool isExists = System.IO.Directory.Exists(path);
            if (!isExists)
                System.IO.Directory.CreateDirectory(path);
            var file = Path.Combine(path, FileUpload1.FileName);
            FileUpload1.SaveAs(file);
        }
    }
于 2013-10-31T11:36:59.633 回答