Question

所以我的文件上传功能已经工作了一段时间，但突然间它已停止工作，即使我在一个新项目中测试并恢复到旧版本的代码后问题仍然存在。

以下是我上传功能的代码。

        public void EnsureDirectoriesExist()
{
    string currentuser = "admin";
    //string currentuser = (string)(Session["uname"]);
    // if the \pix directory doesn't exist - create it. 
    if (!System.IO.Directory.Exists(Server.MapPath(@"~/userimages/" + currentuser + "/displaypicture/")))
    {
        System.IO.Directory.CreateDirectory(Server.MapPath(@"~/userimages/" + currentuser + "/displaypicture/"));
    }

}

protected void uploadbtn_Click(object sender, EventArgs e)
{
    string currentuser = "admin";
    //string currentuser = (string)(Session["uname"]);
    if (FileUpload1.HasFile && Path.GetExtension(FileUpload1.FileName) == ".png")
    {
        // create posted file
        // make sure we have a place for the file in the directory structure
        EnsureDirectoriesExist();
        String filePath = Server.MapPath(@"~/userimages/" + currentuser + "/displaypicture/" + FileUpload1.FileName);
        String filePath2 = ("~/userimages/" + currentuser + "/displaypicture/" + FileUpload1.FileName);
        FileUpload1.SaveAs(filePath);
        SqlConnection conn = new SqlConnection(WebConfigurationManager.ConnectionStrings["myConnectionString"].ToString());

        string mySQL, mySQL2;


        mySQL2 = "DELETE FROM displaypicture WHERE username='" + currentuser + "'";
        mySQL = "INSERT INTO displaypicture(username,path) VALUES ('" + currentuser + "','" + filePath2 + "')";
        conn.Open();
        SqlCommand cmdAdd2 = new SqlCommand(mySQL2, conn);
        SqlCommand cmdAdd = new SqlCommand(mySQL, conn);
        cmdAdd2.ExecuteNonQuery();
        cmdAdd.ExecuteNonQuery();

        conn.Close();


        MessageBox.Show("Upload successful!");

    }
    else
    {
        MessageBox.Show("Upload has failed. Please check file format.");
    }
    }

所以基本上我被带到了else函数，因为if函数似乎不正确。但是，我可以发誓说它工作了大约2个星期才突然不起作用。我还将if函数切换为，

if(currentuser.equals("admin")){
}

测试我的if else要求语句是否正确，当我这样做时，if函数运行但是只创建目录但文件没有上传到目录中。

Answer 1

表单中是否有UpdatePanel？可以在Page，MasterPage或UserControl中。

FileUpload（或input type='file'）与异步（Ajax）回发不兼容。要解决此问题，请删除UpdatePanel，或将提交按钮设置为PostBackTrigger或在此处查看我的答案：https://stackoverflow.com/a/3868293/245581

ASP FileUpload突然无法正常工作

1 个答案: