javascript - jquery ajax成功之前先完成調用

Question

我正在編寫jQuery代碼來下載文件，下載文件之後必須從服務器刪除。以下是我的文件下載和刪除文件的代碼。

if (method == "ValueAddedReportExportToExcel") {     
    $.ajax({ 
     async: false, 
     type: "post", 
     cache: false, 
     url: '@Url.Action("ValueAddedReportExportToExcel", "report")', 
     data: { 
      fromDate: $('#txtFromDate').val(), 
      toDate: $('#txtToDate').val(), 
      reportForWhom: $("#ddlReportForWhom").val(), 
      customers: (ddlCustomers != null) ? ddlCustomers.join(',') : "", 
      salesReps: (salesReps != null) ? salesReps.join(',') : "", 
      users: (users != null) ? users.join(',') : "", 
      emailTo: emailTo, 
      subject: subject, 
      body: body, 
     }, 
     success: function (data) { 
      fileName = data.fileName; 

      // call to download action.   
      window.location = '@Url.Action("Download", "Report")' + '?file=' + data.fileName; 
      console.log('Success Call'); 
     }, 
     complete: function() { 
      console.log('Complete Call'); 
      $.ajax({ 
       async: false, 
       type: "post", 
       url: '@Url.Action("DeleteFile", "Report")', 
       data: { file: filename }, 
       success: function() { 
        alert(filename + ' is deleted successfuly. '); 
       } 
      }); 
     } 
    }); 
    //methodURL = '@Url.Action("ValueAddedReportExportToExcel", "report")'; 
} 

下面兩個函數是用於控制器中的下載和刪除功能。

public virtual ActionResult Download(string file) 
{ 
    string fullPath = Path.Combine(Server.MapPath("~/CostSavingReport"), file); 
    byte[] fileBytes = System.IO.File.ReadAllBytes(fullPath); 
    //return File(fileBytes, "application/vnd.ms-excel", file); 
    return File(fileBytes, System.Net.Mime.MediaTypeNames.Application.Octet, file); 
} 

public virtual void DeleteFile(string file) 
{ 
    try 
    { 
     var fullPath = Path.Combine(Server.MapPath("~/CostSavingReport"), file); 
     if (System.IO.File.Exists(fullPath)) 
     { 
      System.IO.File.Delete(fullPath); 
     } 
    } 
    catch (Exception) 
    { 
    } 
} 

現在的問題是第一DeleteFile動作被調用，而不是Download動作怎麼做，使先打電話Download和之後DeleteFile。

Answer 1

像下面這一行動執行您可以創建自定義屬性被執行

public class DeleteFileAttribute : ActionFilterAttribute 
{ 
    public override void OnActionExecuted(ActionExecutedContext filterContext) 
    { 
     // Delete file 
    } 
} 

你的方法後，並用它在你的行動

[DeleteFileAttribute] 
public virtual ActionResult Download(string file) 
{ 
    string fullPath = Path.Combine(Server.MapPath("~/CostSavingReport"), file); 
    byte[] fileBytes = System.IO.File.ReadAllBytes(fullPath); 
    //return File(fileBytes, "application/vnd.ms-excel", file); 
    return File(fileBytes, System.Net.Mime.MediaTypeNames.Application.Octet, file); 
}