动态生成的文件上传给不了选项 [英] Dynamically generated FileUploads can't give options
问题描述
我在我的 ASPX 页一些控件动态添加。我需要动态添加它们，因为控制量取决于数据库记录。
I'm adding at my ASPX page some controls dynamically. I need to add dynamically them, because the amount of controls depends on database record.
我用的UpdatePanel 并动态添加控件这样的：
I'm using UpdatePanel and adding controls dynamically like that:
void AddFileUploadFields()
{
for (int i = 0; i < Helper.uploadFieldsCount; i++)
{
FileUpload fileUpload = new FileUpload();
string controlId = DateTime.Now.Ticks.ToString();
Thread.Sleep(10); // for non-equal ID for each control
fileUpload.ID = controlId;
uploadFormsId.Add(controlId);
UpdatePanel1.ContentTemplateContainer.Controls.Add(fileUpload);
PlaceHolder1.Controls.Add(fileUpload);
}
}
再从按钮，这是静态在ASP标签定义的＆LT; ASP：按钮... /＆GT; 我想处理文件的信息，我要上传
Then from the button, which was defined statically in asp-tag <asp:Button ... /> I'm trying to handle the file info, which I want to upload:
void buttonUpload_Click(object sender, EventArgs e)
{
var iEnum = uploadFormsId.GetEnumerator();
List<UploadFormDetails> uploadsInfo = new List<UploadFormDetails>();
List<string> generatedFileNames = new List<string>();
bool wereErrors = false;
while (iEnum.MoveNext())
{
FileUpload uploadForm = (FileUpload)FindControl(iEnum.Current.ToString());
uploadsInfo.Add(new UploadFormDetails(uploadForm.ID, uploadForm.HasFile, uploadForm.FileName));
}
...
}
主要的问题确实发生在这里：
The main problem does occur here:
的FileUpload uploadForm =（文件上传）的FindControl（iEnum.Current.ToString（））;
当我得到这样的控制，它的所有选项，如 .HasFile 或 .FileName 是无法看到的。它只是看起来像没有保存的选项一个新的控制。当然，我选择的测试某些文件时，请不要认为我试图从空的形式上传。
When I'm getting control like that, all options of it, like .HasFile or .FileName are unavailable to see. It just looks like a new control with no saved options. Of course, I'm selecting some file for the test, please don't think that I'm trying to upload from empty form.
我怎么能解决？我不能上传任何文件...
How could i fix it? I can't upload any file...
推荐答案
我发现了一个解决方案，但结果我有被设计在其他的方式，不使用服务器控件 ASP.NET中，我处理的纯 HTML 元素。
I found a solution, but the result I've got is designed in other way, which doesn't use Server controls of ASP.NET, I handled the plain HTML elements.
在ASPX页面，我定义的：
In ASPX page, I defined:
<%
for (int i = 0; i < Helper.uploadFieldsCount; i++)
{
Response.Write("<input type='file' id='uploadField" + i.ToString() + "' name='uploadField" + i.ToString() + "' class='file_1' /><br />");
}
%>
RUNAT 在页面的主要形式定义，在开始的时候：
runat was defined in the main form of the page, in the beginning:
<body>
<form enctype="multipart/form-data" id="form1" runat="server">
...
在 codeBehind 我上传与基于 GUID 随机生成的文件名的文件：
In the CodeBehind I'm uploading a new file with randomly generated name based on GUID:
void buttonUpload_Click(object sender, EventArgs e)
{
List<string> generatedFileNames = new List<string>();
bool wereErrors = false;
for (int i = 0; i < Helper.uploadFieldsCount; i++)
{
HttpPostedFile filePosted = Request.Files["uploadField" + i.ToString()];
if (filePosted != null && filePosted.ContentLength > 0)
{
string fileNameApplication = System.IO.Path.GetFileName(filePosted.FileName);
string fileExtensionApplication = System.IO.Path.GetExtension(fileNameApplication);
string newFile = Guid.NewGuid().ToString() + fileExtensionApplication;
string filePath = System.IO.Path.Combine(Server.MapPath("uploads"), newFile);
if (fileNameApplication != String.Empty)
{
generatedFileNames.Add(newFile);
filePosted.SaveAs(filePath);
}
}
...
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