webapi实现图形验证码功能，包含两种方式，一种是存取session，一种是redis缓存,源码包含三种类型的图形验证码样式，还有两种方式的验证。
资源文件列表
Captcha/.vs/Captcha/v15/.suo , 287744
Captcha/.vs/Captcha/v15/Server/sqlite3/db.lock , 0
Captcha/.vs/Captcha/v15/Server/sqlite3/storage.ide , 1671168
Captcha/.vs/Captcha/v15/Server/sqlite3/storage.ide-shm , 32768
Captcha/.vs/Captcha/v15/Server/sqlite3/storage.ide-wal , 4140632
Captcha/.vs/config/applicationhost.config , 83884
Captcha/Captcha/App_Start/BundleConfig.cs , 1084
Captcha/Captcha/App_Start/FilterConfig.cs , 275
Captcha/Captcha/App_Start/RouteConfig.cs , 600
Captcha/Captcha/App_Start/WebApiConfig.cs , 737
Captcha/Captcha/Areas/HelpPage/ApiDescriptionExtensions.cs , 1535
Captcha/Captcha/Areas/HelpPage/App_Start/HelpPageConfig.cs , 6597
Captcha/Captcha/Areas/HelpPage/Controllers/HelpController.cs , 1942
Captcha/Captcha/Areas/HelpPage/HelpPage.css , 2445
Captcha/Captcha/Areas/HelpPage/HelpPageAreaRegistration.cs , 690
Captcha/Captcha/Areas/HelpPage/HelpPageConfigurationExtensions.cs , 24534
Captcha/Captcha/Areas/HelpPage/ModelDescriptions/CollectionModelDescription.cs , 200
Captcha/Captcha/Areas/HelpPage/ModelDescriptions/ComplexTypeModelDescription.cs , 394
Captcha/Captcha/Areas/HelpPage/ModelDescriptions/DictionaryModelDescription.cs , 146
Captcha/Captcha/Areas/HelpPage/ModelDescriptions/EnumTypeModelDescription.cs , 415
Captcha/Captcha/Areas/HelpPage/ModelDescriptions/EnumValueDescription.cs , 249
Captcha/Captcha/Areas/HelpPage/ModelDescriptions/IModelDocumentationProvider.cs , 263
Captcha/Captcha/Areas/HelpPage/ModelDescriptions/KeyValuePairModelDescription.cs , 274
Captcha/Captcha/Areas/HelpPage/ModelDescriptions/ModelDescription.cs , 345
Captcha/Captcha/Areas/HelpPage/ModelDescriptions/ModelDescriptionGenerator.cs , 19530
Captcha/Captcha/Areas/HelpPage/ModelDescriptions/ModelNameAttribute.cs , 575
Captcha/Captcha/Areas/HelpPage/ModelDescriptions/ModelNameHelper.cs , 1471
Captcha/Captcha/Areas/HelpPage/ModelDescriptions/ParameterAnnotation.cs , 238
Captcha/Captcha/Areas/HelpPage/ModelDescriptions/ParameterDescription.cs , 558
Captcha/Captcha/Areas/HelpPage/ModelDescriptions/SimpleTypeModelDescription.cs , 134
Captcha/Captcha/Areas/HelpPage/Models/HelpPageApiModel.cs , 4051
Captcha/Captcha/Areas/HelpPage/SampleGeneration/HelpPageSampleGenerator.cs , 21400
Captcha/Captcha/Areas/HelpPage/SampleGeneration/HelpPageSampleKey.cs , 6643
Captcha/Captcha/Areas/HelpPage/SampleGeneration/ImageSample.cs , 1090
Captcha/Captcha/Areas/HelpPage/SampleGeneration/InvalidSample.cs , 1005
Captcha/Captcha/Areas/HelpPage/SampleGeneration/ObjectGenerator.cs , 19944
Captcha/Captcha/Areas/HelpPage/SampleGeneration/SampleDirection.cs , 234
Captcha/Captcha/Areas/HelpPage/SampleGeneration/TextSample.cs , 919
Captcha/Captcha/Areas/HelpPage/Views/Help/Api.cshtml , 661
Captcha/Captcha/Areas/HelpPage/Views/Help/DisplayTemplates/ApiGroup.cshtml , 1222
Captcha/Captcha/Areas/HelpPage/Views/Help/DisplayTemplates/CollectionModelDescription.cshtml , 200
Captcha/Captcha/Areas/HelpPage/Views/Help/DisplayTemplates/ComplexTypeModelDescription.cshtml , 134
Captcha/Captcha/Areas/HelpPage/Views/Help/DisplayTemplates/DictionaryModelDescription.cshtml , 394
Captcha/Captcha/Areas/HelpPage/Views/Help/DisplayTemplates/EnumTypeModelDescription.cshtml , 693
Captcha/Captcha/Areas/HelpPage/Views/Help/DisplayTemplates/HelpPageApiModel.cshtml , 1795
Captcha/Captcha/Areas/HelpPage/Views/Help/DisplayTemplates/ImageSample.cshtml , 77
Captcha/Captcha/Areas/HelpPage/Views/Help/DisplayTemplates/InvalidSample.cshtml , 244
Captcha/Captcha/Areas/HelpPage/Views/Help/DisplayTemplates/KeyValuePairModelDescription.cshtml , 390
Captcha/Captcha/Areas/HelpPage/Views/Help/DisplayTemplates/ModelDescriptionLink.cshtml , 957
Captcha/Captcha/Areas/HelpPage/Views/Help/DisplayTemplates/Parameters.cshtml , 1687
Captcha/Captcha/Areas/HelpPage/Views/Help/DisplayTemplates/Samples.cshtml , 928
Captcha/Captcha/Areas/HelpPage/Views/Help/DisplayTemplates/SimpleTypeModelDescription.cshtml , 104
Captcha/Captcha/Areas/HelpPage/Views/Help/DisplayTemplates/TextSample.cshtml , 94
Captcha/Captcha/Areas/HelpPage/Views/Help/Index.cshtml , 1169
Captcha/Captcha/Areas/HelpPage/Views/Help/ResourceModel.cshtml , 597
Captcha/Captcha/Areas/HelpPage/Views/Shared/_Layout.cshtml , 267
Captcha/Captcha/Areas/HelpPage/Views/Web.config , 1853
Captcha/Captcha/Areas/HelpPage/Views/_ViewStart.cshtml , 165
Captcha/Captcha/Areas/HelpPage/XmlDocumentationProvider.cs , 7179
Captcha/Captcha/bin/Antlr3.Runtime.dll , 103424
Captcha/Captcha/bin/Antlr3.Runtime.pdb , 435712
Captcha/Captcha/bin/Captcha.dll , 64512
Captcha/Captcha/bin/Captcha.dll.config , 4801
Captcha/Captcha/bin/Captcha.pdb , 169472
Captcha/Captcha/bin/Common.dll , 13312
Captcha/Captcha/bin/Common.pdb , 40448
Captcha/Captcha/bin/Microsoft.AspNet.TelemetryCorrelation.dll , 23032
Captcha/Captcha/bin/Microsoft.AspNet.TelemetryCorrelation.xml , 5525
Captcha/Captcha/bin/Microsoft.CodeDom.Providers.DotNetCompilerPlatform.dll , 40080
Captcha/Captcha/bin/Microsoft.CodeDom.Providers.DotNetCompilerPlatform.xml , 1805
Captcha/Captcha/bin/Microsoft.Web.Infrastructure.dll , 45416
Captcha/Captcha/bin/Microsoft.Win32.Primitives.dll , 21216
Captcha/Captcha/bin/netstandard.dll , 98616
Captcha/Captcha/bin/Newtonsoft.Json.dll , 664576
Captcha/Captcha/bin/Newtonsoft.Json.xml , 684778
Captcha/Captcha/bin/roslyn/csc.exe , 49584
Captcha/Captcha/bin/roslyn/csc.exe.config , 8220
Captcha/Captcha/bin/roslyn/csc.rsp , 1496
Captcha/Captcha/bin/roslyn/csi.exe , 15280
Captcha/Captcha/bin/roslyn/csi.exe.config , 8816
Captcha/Captcha/bin/roslyn/csi.rsp , 279
Captcha/Captcha/bin/roslyn/Microsoft.Build.Tasks.CodeAnalysis.dll , 122800
Captcha/Captcha/bin/roslyn/Microsoft.CodeAnalysis.CSharp.dll , 4681136
Captcha/Captcha/bin/roslyn/Microsoft.CodeAnalysis.CSharp.Scripting.dll , 29104
Captcha/Captcha/bin/roslyn/Microsoft.CodeAnalysis.dll , 2414512
Captcha/Captcha/bin/roslyn/Microsoft.CodeAnalysis.Scripting.dll , 128432
Captcha/Captcha/bin/roslyn/Microsoft.CodeAnalysis.VisualBasic.dll , 5223856
Captcha/Captcha/bin/roslyn/Microsoft.CSharp.Core.targets , 6818
Captcha/Captcha/bin/roslyn/Microsoft.DiaSymReader.Native.amd64.dll , 1495800
Captcha/Captcha/bin/roslyn/Microsoft.DiaSymReader.Native.x86.dll , 1188080
Captcha/Captcha/bin/roslyn/Microsoft.Managed.Core.targets , 7040
Captcha/Captcha/bin/roslyn/Microsoft.VisualBasic.Core.targets , 6236
Captcha/Captcha/bin/roslyn/System.AppContext.dll , 20168
Captcha/Captcha/bin/roslyn/System.Collections.Immutable.dll , 244432
Captcha/Captcha/bin/roslyn/System.Console.dll , 34496
Captcha/Captcha/bin/roslyn/System.Diagnostics.FileVersionInfo.dll , 23464
Captcha/Captcha/bin/roslyn/System.Diagnostics.StackTrace.dll , 23288
Captcha/Captcha/bin/roslyn/System.IO.Compression.dll , 111984
Captcha/Captcha/bin/roslyn/System.IO.FileSystem.dll , 22736
Captcha/Captcha/bin/roslyn/System.IO.FileSystem.Primitives.dll , 22784
Captcha/Captcha/bin/roslyn/System.IO.Pipes.AccessControl.dll , 24984
Captcha/Captcha/bin/roslyn/System.IO.Pipes.dll , 22872
Captcha/Captcha/bin/roslyn/System.Reflection.Metadata.dll , 465104
Captcha/Captcha/bin/roslyn/System.Security.AccessControl.dll , 37784
Captcha/Captcha/bin/roslyn/System.Security.Claims.dll , 24792
Captcha/Captcha/bin/roslyn/System.Security.Cryptography.Algorithms.dll , 39872
Captcha/Captcha/bin/roslyn/System.Security.Cryptography.Encoding.dll , 23480
Captcha/Captcha/bin/roslyn/System.Security.Cryptography.Primitives.dll , 22816
Captcha/Captcha/bin/roslyn/System.Security.Cryptography.X509Certificates.dll , 38872
Captcha/Captcha/bin/roslyn/System.Security.Principal.Windows.dll , 23464
Captcha/Captcha/bin/roslyn/System.Text.Encoding.CodePages.dll , 766872
Captcha/Captcha/bin/roslyn/System.ValueTuple.dll , 77672
Captcha/Captcha/bin/roslyn/System.Xml.ReaderWriter.dll , 23264
Captcha/Captcha/bin/roslyn/System.Xml.XmlDocument.dll , 23256
Captcha/Captcha/bin/roslyn/System.Xml.XPath.dll , 22720
Captcha/Captcha/bin/roslyn/System.Xml.XPath.XDocument.dll , 25320
Captcha/Captcha/bin/roslyn/vbc.exe , 49584
Captcha/Captcha/bin/roslyn/vbc.exe.config , 8220
Captcha/Captcha/bin/roslyn/vbc.rsp , 1634
Captcha/Captcha/bin/roslyn/VBCSCompiler.exe , 87984
Captcha/Captcha/bin/roslyn/VBCSCompiler.exe.config , 8437
Captcha/Captcha/bin/ServiceStack.Common.dll , 476672
Captcha/Captcha/bin/ServiceStack.Common.xml , 32301
Captcha/Captcha/bin/ServiceStack.Interfaces.dll , 139776
Captcha/Captcha/bin/ServiceStack.Interfaces.xml , 112156
Captcha/Captcha/bin/ServiceStack.Redis.dll , 292864
Captcha/Captcha/bin/ServiceStack.Redis.xml , 98966
Captcha/Captcha/bin/ServiceStack.Text.dll , 442368
Captcha/Captcha/bin/ServiceStack.Text.xml , 76934
Captcha/Captcha/bin/System.AppContext.dll , 21176
Captcha/Captcha/bin/System.Buffers.dll , 27992
Captcha/Captcha/bin/System.Buffers.xml , 3195
Captcha/Captcha/bin/System.Collections.Concurrent.dll , 21224
Captcha/Captcha/bin/System.Collections.dll , 21696
Captcha/Captcha/bin/System.Collections.NonGeneric.dll , 21224
Captcha/Captcha/bin/System.Collections.Specialized.dll , 21224
Captcha/Captcha/bin/System.ComponentModel.dll , 21192
Captcha/Captcha/bin/System.ComponentModel.EventBasedAsync.dll , 21768
Captcha/Captcha/bin/System.ComponentModel.Primitives.dll , 21752
Captcha/Captcha/bin/System.ComponentModel.TypeConverter.dll , 22784
Captcha/Captcha/bin/System.Console.dll , 21160
Captcha/Captcha/bin/System.Data.Common.dll , 154448
Captcha/Captcha/bin/System.Diagnostics.Contracts.dll , 21736
Captcha/Captcha/bin/System.Diagnostics.Debug.dll , 21208
Captcha/Captcha/bin/System.Diagnostics.DiagnosticSource.dll , 55728
Captcha/Captcha/bin/System.Diagnostics.DiagnosticSource.xml , 6092
Captcha/Captcha/bin/System.Diagnostics.FileVersionInfo.dll , 21248
Captcha/Captcha/bin/System.Diagnostics.Process.dll , 21728
Captcha/Captcha/bin/System.Diagnostics.StackTrace.dll , 23936
Captcha/Captcha/bin/System.Diagnostics.TextWriterTraceListener.dll , 21280
Captcha/Captcha/bin/System.Diagnostics.Tools.dll , 21208
最多只能显示150条信息!