.NET 大文件上传下载

一、文件上传

• 配置Web.config

  <system.web>
    <compilation debug="true" targetFramework="4.5.2" />
    <!--<httpRuntime targetFramework="4.5.2" maxRequestLength="2147483647" executionTimeout="3600"/>-->
    <httpRuntime executionTimeout="3600" maxRequestLength="2147483647" useFullyQualifiedRedirectUrl="true" minFreeThreads="8" minLocalRequestFreeThreads="4" appRequestQueueLimit="100" enableVersionHeader="true" />
    <httpModules>
      <add name="ApplicationInsightsWebTracking" type="Microsoft.ApplicationInsights.Web.ApplicationInsightsHttpModule, Microsoft.AI.Web" />
    </httpModules>
  </system.web>

• cshtml前端控件

<div id="div_filemanager_list_header_upload">
        <input onclick="uploadFile()" class="button"  type="button" value="上传文件" />
</div>

• 读取file，使用ajax上传

  var file = document.getElementById("input_file").files[0];
if (file.size > 2147480000)//
            {
                alert("文件不得大于2GB!");
return;
            }

 //获取文件信息
var formData = new FormData();
            formData.append("file", file);
            formData.append("fileinfo", JSON.stringify(fileinfo));
            currentAjax = $.ajax({
                url: "/FileManager/UpLoadFile",
                type: "post",
// Form数据
                data: formData,
                dataType: "text",
                processData: false,
                contentType: false,
                xhr: function () {
var xhr = $.ajaxSettings.xhr();
                    console.log(xhr.status);
if (onmyprogress && xhr.upload) {
                        xhr.upload.addEventListener("progress", onmyprogress, false);
return xhr;
                    }
                },
                success: function (data) {
                },
                error: function (XMLHttpRequest, textStatus, errorThrown) {
                }
            });

• 后台接收文件并保存

            var files = Request.Files;
var json = Request.Form["fileinfo"];
if (files.Count > 0)
            {
var file = files[0];
string fileName = file.FileName.Split('\\').Last();
string fileSaveFolder = HttpRuntime.AppDomainAppPath.ToString() + "Data\\File\\" + DateTime.Now.ToFileTime().ToString() + "\\";
                tb_FileInfo fileInfo = new tb_FileInfo();
string fileSavePath = null;//带文件名路径
//读取文件并保存
try
                {
if (!Directory.Exists(fileSaveFolder)) Directory.CreateDirectory(fileSaveFolder);
                    fileInfo = JsonConvert.DeserializeObject<tb_FileInfo>(json) as tb_FileInfo;
                    fileSavePath = Path.Combine(fileSaveFolder, fileName);
                    file.SaveAs(fileSavePath);
                }
catch
                {
return "读取文件错误！";
                }
　　　　　　　　}

 二、下载文件

在服务器端生成文件后，前台使用window.open(url)直接访问文件。