在Web API中使用jQuery AJAX实现文件上传的例子，传统的form表单提交会导致页面刷新，但是在有些情况下，我们不希望页面被刷新，这种时候我们都是使用Ajax的方式进行请求，将文件post后台api接口上传到服务器，后端开发者可以借鉴学习。
资源文件列表
TestFileUpload/packages/Microsoft.AspNet.WebApi.5.2.2/Microsoft.AspNet.WebApi.5.2.2.nupkg , 3173
TestFileUpload/packages/Microsoft.AspNet.WebApi.Client.5.2.2/lib/net45/System.Net.Http.Formatting.dll , 185032
TestFileUpload/packages/Microsoft.AspNet.WebApi.Client.5.2.2/lib/net45/System.Net.Http.Formatting.xml , 192626
TestFileUpload/packages/Microsoft.AspNet.WebApi.Client.5.2.2/lib/portable-wp8+netcore45+net45+wp81+wpa81/System.Net.Http.Formatting.dll , 150728
TestFileUpload/packages/Microsoft.AspNet.WebApi.Client.5.2.2/lib/portable-wp8+netcore45+net45+wp81+wpa81/System.Net.Http.Formatting.xml , 279955
TestFileUpload/packages/Microsoft.AspNet.WebApi.Client.5.2.2/Microsoft.AspNet.WebApi.Client.5.2.2.nupkg , 188633
TestFileUpload/packages/Microsoft.AspNet.WebApi.Core.5.2.2/Content/web.config.transform , 485
TestFileUpload/packages/Microsoft.AspNet.WebApi.Core.5.2.2/lib/net45/System.Web.Http.dll , 471240
TestFileUpload/packages/Microsoft.AspNet.WebApi.Core.5.2.2/lib/net45/System.Web.Http.xml , 539657
TestFileUpload/packages/Microsoft.AspNet.WebApi.Core.5.2.2/Microsoft.AspNet.WebApi.Core.5.2.2.nupkg , 239377
TestFileUpload/packages/Microsoft.AspNet.WebApi.WebHost.5.2.2/lib/net45/System.Web.Http.WebHost.dll , 82120
TestFileUpload/packages/Microsoft.AspNet.WebApi.WebHost.5.2.2/lib/net45/System.Web.Http.WebHost.xml , 10367
TestFileUpload/packages/Microsoft.AspNet.WebApi.WebHost.5.2.2/Microsoft.AspNet.WebApi.WebHost.5.2.2.nupkg , 42998
TestFileUpload/packages/Newtonsoft.Json.6.0.4/lib/net20/Newtonsoft.Json.dll , 493056
TestFileUpload/packages/Newtonsoft.Json.6.0.4/lib/net20/Newtonsoft.Json.xml , 516034
TestFileUpload/packages/Newtonsoft.Json.6.0.4/lib/net35/Newtonsoft.Json.dll , 430080
TestFileUpload/packages/Newtonsoft.Json.6.0.4/lib/net35/Newtonsoft.Json.xml , 459802
TestFileUpload/packages/Newtonsoft.Json.6.0.4/lib/net40/Newtonsoft.Json.dll , 493056
TestFileUpload/packages/Newtonsoft.Json.6.0.4/lib/net40/Newtonsoft.Json.xml , 478726
TestFileUpload/packages/Newtonsoft.Json.6.0.4/lib/net45/Newtonsoft.Json.dll , 502272
TestFileUpload/packages/Newtonsoft.Json.6.0.4/lib/net45/Newtonsoft.Json.xml , 478726
TestFileUpload/packages/Newtonsoft.Json.6.0.4/lib/netcore45/Newtonsoft.Json.dll , 446976
TestFileUpload/packages/Newtonsoft.Json.6.0.4/lib/netcore45/Newtonsoft.Json.xml , 448530
TestFileUpload/packages/Newtonsoft.Json.6.0.4/lib/portable-net40+sl5+wp80+win8+wpa81/Newtonsoft.Json.dll , 387072
TestFileUpload/packages/Newtonsoft.Json.6.0.4/lib/portable-net40+sl5+wp80+win8+wpa81/Newtonsoft.Json.xml , 425586
TestFileUpload/packages/Newtonsoft.Json.6.0.4/lib/portable-net45+wp80+win8+wpa81/Newtonsoft.Json.dll , 444928
TestFileUpload/packages/Newtonsoft.Json.6.0.4/lib/portable-net45+wp80+win8+wpa81/Newtonsoft.Json.xml , 448549
TestFileUpload/packages/Newtonsoft.Json.6.0.4/Newtonsoft.Json.6.0.4.nupkg , 1513616
TestFileUpload/packages/Newtonsoft.Json.6.0.4/tools/install.ps1 , 3229
TestFileUpload/packages/repositories.config , 133
TestFileUpload/TestFileUpload.sln , 1011
TestFileUpload/TestFileUpload.v12.suo , 49152
TestFileUpload/TestFileUpload/FileUploadController.cs , 1676
TestFileUpload/TestFileUpload/FileUploadTest.aspx , 2150
TestFileUpload/TestFileUpload/FileUploadTest.aspx.cs , 342
TestFileUpload/TestFileUpload/FileUploadTest.aspx.designer.cs , 776
TestFileUpload/TestFileUpload/Global.asax , 98
TestFileUpload/TestFileUpload/Global.asax.cs , 1204
TestFileUpload/TestFileUpload/packages.config , 498
TestFileUpload/TestFileUpload/Properties/AssemblyInfo.cs , 1399
TestFileUpload/TestFileUpload/TestFileUpload.csproj , 6808
TestFileUpload/TestFileUpload/TestFileUpload.csproj.user , 1094
TestFileUpload/TestFileUpload/Web.config , 756
TestFileUpload/TestFileUpload/Web.Debug.config , 1299
TestFileUpload/TestFileUpload/Web.Release.config , 1360