我正在开发一个导入和处理 CSV 文件的 ASP.NET MVC 4 应用程序。我正在使用标准表单和 Controller 进行上传。以下是我目前正在做的事情的概述:
Controller 逻辑
public ActionResult ImportRecords(HttpPostedFileBase importFile){
var fp = Path.Combine(HttpContext.Server.MapPath("~/ImportUploads"), Path.GetFileName(uploadFile.FileName));
uploadFile.SaveAs(fp);
var fileIn = new FileInfo(fp);
var reader = fileIn.OpenText();
var tfp = new TextFieldParser(reader) {TextFieldType = FieldType.Delimited, Delimiters = new[] {","}};
while(!tfp.EndOfData){
//Parse records into domain object and save to database
}
...
}
HTML
@using (Html.BeginForm("ImportRecords", "Import", FormMethod.Post, new { @id = "upldFrm", @enctype = "multipart/form-data" }))
{
<input id="uploadFile" name="uploadFile" type="file" />
<input id="subButton" type="submit" value="UploadFile" title="Upload File" />
}
导入文件可能包含大量记录(平均 40K+)，可能需要相当长的时间才能完成。我不想让用户在导入屏幕前为每个处理的文件等待 5 分钟以上。我考虑过添加一个控制台应用程序来监视上传文件夹中的新文件，并在添加新内容时进行处理，但我想在开始我的这条道路之前先看看我从社区收到了什么输入。
有没有更有效的方法来处理这个操作？
有没有办法执行这个 Action ，让用户继续他/她的快乐方式，然后在处理完成时通知用户？
最佳答案
我遇到的问题的解决方案有点复杂，但与 IFrame 修复类似。结果是一个弹出窗口来处理处理，允许用户继续在整个站点中导航。
文件被提交到服务器(UploadCSV Controller )，一个成功页面被返回，其中包含一些 JavaScript 来处理处理的初始启动。当用户单击“开始处理”时，将打开一个新窗口(ImportProcessing/Index)加载初始状态(启动一个间隔循环来检索状态更新)，然后调用“StartProcessing”操作，启动处理过程。
我正在使用的“FileProcessor”类位于 ImportProcessing Controller 内的一个静态字典变量中；允许基于 key 的状态结果。操作完成或遇到错误后，FileProcessor 会被及时删除。
上传 Controller :
[AcceptVerbs(HttpVerbs.Post)]
public ActionResult UploadCSV(HttpPostedFileBase uploadFile)
{
var filePath = string.Empty;
if (uploadFile.ContentLength <= 0)
{
return View();
}
filePath = Path.Combine(Server.MapPath(this.UploadPath), "DeptartmentName",Path.GetFileName(uploadFile.FileName));
if (new FileInfo(filePath).Exists)
{
ViewBag.ErrorMessage =
"The file currently exists on the server. Please rename the file you are trying to upload, delete the file from the server," +
"or contact IT if you are unsure of what to do.";
return View();
}
else
{
uploadFile.SaveAs(filePath);
return RedirectToAction("UploadSuccess", new {fileName = uploadFile.FileName, processType = "sonar"});
}
}
[HttpGet]
public ActionResult UploadSuccess(string fileName, string processType)
{
ViewBag.FileName = fileName;
ViewBag.PType = processType;
return View();
}
上传成功HTML:
@{
ViewBag.Title = "UploadSuccess";
}
<h2>File was uploaded successfully</h2>
<p>Your file was uploaded to the server and is now ready to be processed. To begin processing this file, click the "Process File" button below.
</p>
<button id="beginProcess" >Process File</button>
<script type="text/javascript">
$(function () {
$("#beginProcess").click(BeginProcess);
function BeginProcess() {
window.open("/SomeController/ImportProcessing/Index?fileName=@ViewBag.FileName&type=@ViewBag.PType", "ProcessStatusWin", "width=400, height=250, status=0, toolbar=0, scrollbars=0, resizable=0");
window.location = "/Department/Import/Index";
}
});
</script>
一旦这个新窗口打开，文件处理就开始了。从自定义 FileProcessing 类中检索更新。
导入处理 Controller :
public ActionResult Index(string fileName, string type)
{
ViewBag.File = fileName;
ViewBag.PType = type;
switch (type)
{
case "somematch":
if (!_fileProcessors.ContainsKey(fileName)) _fileProcessors.Add(fileName, new SonarCsvProcessor(Path.Combine(Server.MapPath(this.UploadPath), "DepartmentName", fileName), true));
break;
default:
break;
}
return PartialView();
}
进口加工指数:
@{
ViewBag.Title = "File Processing Status";
}
@Scripts.Render("~/Scripts/jquery-1.8.2.js")
<div id="StatusWrapper">
<div id="statusWrap"></div>
</div>
<script type="text/javascript">
$(function () {
$.ajax({
url: "GetStatusPage",
data: { fileName: "@ViewBag.File" },
type: "GET",
success: StartStatusProcess,
error: function () {
$("#statusWrap").html("<h3>Unable to load status checker</h3>");
}
});
function StartStatusProcess(result) {
$("#statusWrap").html(result);
$.ajax({
url: "StartProcessing",
data: { fileName: "@ViewBag.File" },
type: "GET",
success: function (data) {
var messag = 'Processing complete!\n Added ' + data.CurrentRecord + ' of ' + data.TotalRecords + " records in " + data.ElapsedTime + " seconds";
$("#statusWrap #message").html(messag);
$("#statusWrap #progressBar").attr({ value: 100, max: 100 });
setTimeout(function () {
window.close();
}, 5000);
},
error: function (xhr, status) {
alert("Error processing file");
}
});
}
});
</script>
最后是状态检查器 html:
@{
ViewBag.Title = "GetStatusPage";
}
<h2>Current Processing Status</h2>
<h5>Processing: @ViewBag.File</h5>
<h5>Updated: <span id="processUpdated"></span></h5>
<span id="message"></span>
<br />
<progress id="progressBar"></progress>
<script type="text/javascript">
$(function () {
var checker = undefined;
GetStatus();
function GetStatus() {
if (checker == undefined) {
checker = setInterval(GetStatus, 3000);
}
$.ajax({
url: "GetStatus?fileName=@ViewBag.File",
type: "GET",
success: function (result) {
result = result || {
Available: false,
Status: {
TotalRecords: -1,
CurrentRecord: -1,
ElapsedTime: -1,
Message: "No status data returned"
}
};
if (result.Available == true) {
$("#progressBar").attr({ max: result.Status.TotalRecords, value: result.Status.CurrentRecord });
$("#processUpdated").text(result.Status.Updated);
$("#message").text(result.Status.Message);
} else {
clearInterval(checker);
}
},
error: function () {
$("#statusWrap").html("<h3>Unable to load status checker</h3>");
clearInterval(checker);
}
});
}
});
</script>
关于c# - 在 ASP.NET MVC 4 架构注意事项中上传和处理 CSV 文件，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/13710260/