adding api diff for preview1 and preview2 (#3757)

release-notes/3.1/preview/api-diff/preview2/.Net/3.1-preview2-standalone-packages.md

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+# API Difference standalone-preview1 vs standalone-preview2.
+
+API listing follows standard diff formatting. Lines preceded by a '+' are
+additions and a '-' indicates removal.
+
+* [System.IO.FileSystem.AccessControl](3.1-preview2-standalone-packages_System.IO.FileSystem.AccessControl.md)
+

release-notes/3.1/preview/api-diff/preview2/.Net/3.1-preview2-standalone-packages_System.IO.FileSystem.AccessControl.md

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+# System.IO.FileSystem.AccessControl
+
+``` diff
+ {
+     namespace System.IO {
+         public static class FileSystemAclExtensions {
++            public static void Create(this DirectoryInfo directoryInfo, DirectorySecurity directorySecurity);
+         }
+     }
+ }
+```
+

release-notes/3.1/preview/api-diff/preview2/Asp.Net/3.1-preview2.md

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+# API Difference aspnetcoreapp3.1-preview1 vs aspnetcoreapp3.1-preview2
+
+API listing follows standard diff formatting. Lines preceded by a '+' are
+additions and a '-' indicates removal.
+
+* [Microsoft.AspNetCore.Components](3.1-preview2_Microsoft.AspNetCore.Components.md)
+* [Microsoft.AspNetCore.Components.Forms](3.1-preview2_Microsoft.AspNetCore.Components.Forms.md)
+* [Microsoft.AspNetCore.Mvc](3.1-preview2_Microsoft.AspNetCore.Mvc.md)
+* [Microsoft.AspNetCore.Mvc.ModelBinding](3.1-preview2_Microsoft.AspNetCore.Mvc.ModelBinding.md)
+* [Microsoft.AspNetCore.Mvc.ModelBinding.Metadata](3.1-preview2_Microsoft.AspNetCore.Mvc.ModelBinding.Metadata.md)
+* [Microsoft.AspNetCore.Mvc.Rendering](3.1-preview2_Microsoft.AspNetCore.Mvc.Rendering.md)
+* [Microsoft.AspNetCore.Mvc.TagHelpers](3.1-preview2_Microsoft.AspNetCore.Mvc.TagHelpers.md)
+* [Microsoft.AspNetCore.Server.HttpSys](3.1-preview2_Microsoft.AspNetCore.Server.HttpSys.md)
+* [Microsoft.AspNetCore.SignalR.Protocol](3.1-preview2_Microsoft.AspNetCore.SignalR.Protocol.md)
+

release-notes/3.1/preview/api-diff/preview2/Asp.Net/3.1-preview2_Microsoft.AspNetCore.Components.Forms.md

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+# Microsoft.AspNetCore.Components.Forms
+
+``` diff
+ namespace Microsoft.AspNetCore.Components.Forms {
+-    public abstract class InputBase<TValue> : ComponentBase {
++    public abstract class InputBase<TValue> : ComponentBase, IDisposable {
++        protected virtual void Dispose(bool disposing);
++        void System.IDisposable.Dispose();
+     }
+     public class ValidationSummary : ComponentBase, IDisposable {
++        public object Model { get; set; }
+     }
+ }
+```
+

release-notes/3.1/preview/api-diff/preview2/Asp.Net/3.1-preview2_Microsoft.AspNetCore.Components.md

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+# Microsoft.AspNetCore.Components
+
+``` diff
+ namespace Microsoft.AspNetCore.Components {
+     public sealed class EventHandlerAttribute : Attribute {
++        public EventHandlerAttribute(string attributeName, Type eventArgsType, bool enableStopPropagation, bool enablePreventDefault);
++        public bool EnablePreventDefault { get; }
++        public bool EnableStopPropagation { get; }
+     }
+ }
+```
+

release-notes/3.1/preview/api-diff/preview2/Asp.Net/3.1-preview2_Microsoft.AspNetCore.Mvc.ModelBinding.Metadata.md

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+# Microsoft.AspNetCore.Mvc.ModelBinding.Metadata
+
+``` diff
+ namespace Microsoft.AspNetCore.Mvc.ModelBinding.Metadata {
+     public readonly struct ModelMetadataIdentity : IEquatable<ModelMetadataIdentity> {
++        public PropertyInfo PropertyInfo { get; }
++        public static ModelMetadataIdentity ForProperty(PropertyInfo propertyInfo, Type modelType, Type containerType);
+     }
+ }
+```
+

release-notes/3.1/preview/api-diff/preview2/Asp.Net/3.1-preview2_Microsoft.AspNetCore.Mvc.ModelBinding.md

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+# Microsoft.AspNetCore.Mvc.ModelBinding
+
+``` diff
+ namespace Microsoft.AspNetCore.Mvc.ModelBinding {
++    public sealed class ValueProviderException : Exception {
++        public ValueProviderException(string message);
++        public ValueProviderException(string message, Exception innerException);
++    }
+ }
+```
+

release-notes/3.1/preview/api-diff/preview2/Asp.Net/3.1-preview2_Microsoft.AspNetCore.Mvc.Rendering.md

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+# Microsoft.AspNetCore.Mvc.Rendering
+
+``` diff
+ namespace Microsoft.AspNetCore.Mvc.Rendering {
+     public static class HtmlHelperComponentExtensions {
++        public static Task<IHtmlContent> RenderComponentAsync(this IHtmlHelper htmlHelper, Type componentType, RenderMode renderMode, object parameters);
+     }
+ }
+```
+

release-notes/3.1/preview/api-diff/preview2/Asp.Net/3.1-preview2_Microsoft.AspNetCore.Mvc.TagHelpers.md

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+# Microsoft.AspNetCore.Mvc.TagHelpers
+
+``` diff
+ namespace Microsoft.AspNetCore.Mvc.TagHelpers {
++    public sealed class ComponentTagHelper : TagHelper {
++        public ComponentTagHelper();
++        public Type ComponentType { get; set; }
++        public IDictionary<string, object> Parameters { get; set; }
++        public RenderMode RenderMode { get; set; }
++        public ViewContext ViewContext { get; set; }
++        public override Task ProcessAsync(TagHelperContext context, TagHelperOutput output);
++    }
+ }
+```
+

release-notes/3.1/preview/api-diff/preview2/Asp.Net/3.1-preview2_Microsoft.AspNetCore.Mvc.md

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+# Microsoft.AspNetCore.Mvc
+
+``` diff
+ namespace Microsoft.AspNetCore.Mvc {
++    public class ApiDescriptionActionData {
++        public ApiDescriptionActionData();
++        public string GroupName { get; set; }
++    }
+ }
+```
+

release-notes/3.1/preview/api-diff/preview2/Asp.Net/3.1-preview2_Microsoft.AspNetCore.Server.HttpSys.md

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+# Microsoft.AspNetCore.Server.HttpSys
+
+``` diff
+ namespace Microsoft.AspNetCore.Server.HttpSys {
++    public enum ClientCertificateMethod {
++        AllowCertificate = 1,
++        AllowRenegotation = 2,
++        NoCertificate = 0,
++    }
+     public class HttpSysOptions {
++        public ClientCertificateMethod ClientCertificateMethod { get; set; }
+     }
+ }
+```
+

release-notes/3.1/preview/api-diff/preview2/Asp.Net/3.1-preview2_Microsoft.AspNetCore.SignalR.Protocol.md

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+# Microsoft.AspNetCore.SignalR.Protocol
+
+``` diff
+ namespace Microsoft.AspNetCore.SignalR.Protocol {
+     public class CloseMessage : HubMessage {
++        public CloseMessage(string error, bool allowReconnect);
++        public bool AllowReconnect { get; }
+     }
+ }
+```
+

release-notes/3.1/preview/api-diff/preview2/README.md

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+# .NET Core 3.1 Preview 2 API Changes
+
+The following API changes were made in .NET Core 3.1 Preview 2:
+
+- [.NET Core](./.Net/3.1-preview2-standalone-packages.md)
+- [ASP.NET Core](./Asp.Net/3.1-preview2.md)