Fixed DebuggerDisplay in DefaultTagHelperContent

- Also refactored it in few other places

src/Microsoft.AspNetCore.Razor.Language/AllowedChildTagDescriptor.cs

@@ -8,7 +8,6 @@ using System.Linq;
 
 namespace Microsoft.AspNetCore.Razor.Language
 {
-    [DebuggerDisplay("{DisplayName,nq}")]
     public abstract class AllowedChildTagDescriptor : IEquatable<AllowedChildTagDescriptor>
     {
         public string Name { get; protected set; }
@@ -27,6 +26,11 @@ namespace Microsoft.AspNetCore.Razor.Language
             }
         }
 
+        public override string ToString()
+        {
+            return DisplayName ?? base.ToString();
+        }
+
         public bool Equals(AllowedChildTagDescriptor other)
         {
             return AllowedChildTagDescriptorComparer.Default.Equals(this, other);

src/Microsoft.AspNetCore.Razor.Language/BoundAttributeDescriptor.cs

@@ -3,7 +3,6 @@
 
 using System;
 using System.Collections.Generic;
-using System.Diagnostics;
 using System.Linq;
 
 namespace Microsoft.AspNetCore.Razor.Language
@@ -11,7 +10,6 @@ namespace Microsoft.AspNetCore.Razor.Language
     /// <summary>
     /// A metadata class describing a tag helper attribute.
     /// </summary>
-    [DebuggerDisplay("{DisplayName,nq}")]
     public abstract class BoundAttributeDescriptor : IEquatable<BoundAttributeDescriptor>
     {
         protected BoundAttributeDescriptor(string kind)
@@ -55,6 +53,11 @@ namespace Microsoft.AspNetCore.Razor.Language
             }
         }
 
+        public override string ToString()
+        {
+            return DisplayName ?? base.ToString();
+        }
+
         public bool Equals(BoundAttributeDescriptor other)
         {
             return BoundAttributeDescriptorComparer.Default.Equals(this, other);

src/Microsoft.AspNetCore.Razor.Language/Legacy/LocationTagged.cs

@@ -8,7 +8,7 @@ using Microsoft.Extensions.Internal;
 
 namespace Microsoft.AspNetCore.Razor.Language.Legacy
 {
-    [DebuggerDisplay("({Location})\"{Value}\"")]
+    [DebuggerDisplay("{" + nameof(DebuggerToString) + "(),nq}")]
     internal class LocationTagged<TValue> : IFormattable
     {
         public LocationTagged(TValue value, int absoluteIndex, int lineIndex, int characterIndex)
@@ -80,5 +80,10 @@ namespace Microsoft.AspNetCore.Razor.Language.Legacy
         {
             return value == null ? default(TValue) : value.Value;
         }
+
+        private string DebuggerToString()
+        {
+            return $@"({Location})""{Value}""";
+        }
     }
 }

src/Microsoft.AspNetCore.Razor.Language/Legacy/ParserContext.cs

@@ -56,7 +56,7 @@ namespace Microsoft.AspNetCore.Razor.Language.Legacy
     // Debug Helpers
 
 #if DEBUG
-    [DebuggerDisplay("{Unparsed}")]
+    [DebuggerDisplay("{" + nameof(DebuggerToString) + "(),nq}")]
     internal partial class ParserContext
     {
         private const int InfiniteLoopCountThreshold = 1000;
@@ -98,6 +98,11 @@ namespace Microsoft.AspNetCore.Razor.Language.Legacy
             _infiniteLoopGuardLocation = Source.Location;
             return false;
         }
+
+        private string DebuggerToString()
+        {
+            return Unparsed;
+        }
     }
 #endif
 }

src/Microsoft.AspNetCore.Razor.Language/RazorDiagnosticDescriptor.cs

@@ -6,7 +6,7 @@ using System.Diagnostics;
 
 namespace Microsoft.AspNetCore.Razor.Language
 {
-    [DebuggerDisplay("Error {Id}: {GetMessageFormat()}")]
+    [DebuggerDisplay("{" + nameof(DebuggerToString) + "(),nq}")]
     public sealed class RazorDiagnosticDescriptor : IEquatable<RazorDiagnosticDescriptor>
     {
         private readonly Func<string> _messageFormat;
@@ -56,5 +56,10 @@ namespace Microsoft.AspNetCore.Razor.Language
         {
             return StringComparer.Ordinal.GetHashCode(Id);
         }
+
+        private string DebuggerToString()
+        {
+            return $@"Error ""{Id}"": ""{GetMessageFormat()}""";
+        }
     }
 }

src/Microsoft.AspNetCore.Razor.Language/RazorProjectItem.cs

@@ -9,7 +9,7 @@ namespace Microsoft.AspNetCore.Razor.Language
     /// <summary>
     /// An item in <see cref="RazorProject"/>.
     /// </summary>
-    [DebuggerDisplay("{CombinedPath}")]
+    [DebuggerDisplay("{" + nameof(DebuggerToString) + "()}")]
     public abstract class RazorProjectItem
     {
         /// <summary>
@@ -105,5 +105,10 @@ namespace Microsoft.AspNetCore.Razor.Language
                 }
             }
         }
+
+        private string DebuggerToString()
+        {
+            return CombinedPath;
+        }
     }
 }

src/Microsoft.AspNetCore.Razor.Language/RequiredAttributeDescriptor.cs

@@ -3,12 +3,10 @@
 
 using System;
 using System.Collections.Generic;
-using System.Diagnostics;
 using System.Linq;
 
 namespace Microsoft.AspNetCore.Razor.Language
 {
-    [DebuggerDisplay("{DisplayName,nq}")]
     public abstract class RequiredAttributeDescriptor : IEquatable<RequiredAttributeDescriptor>
     {
         public string Name { get; protected set; }
@@ -33,6 +31,11 @@ namespace Microsoft.AspNetCore.Razor.Language
             }
         }
 
+        public override string ToString()
+        {
+            return DisplayName ?? base.ToString();
+        }
+
         public bool Equals(RequiredAttributeDescriptor other)
         {
             return RequiredAttributeDescriptorComparer.Default.Equals(this, other);

src/Microsoft.AspNetCore.Razor.Language/TagHelperDescriptor.cs

@@ -3,12 +3,10 @@
 
 using System;
 using System.Collections.Generic;
-using System.Diagnostics;
 using System.Linq;
 
 namespace Microsoft.AspNetCore.Razor.Language
 {
-    [DebuggerDisplay("{DisplayName,nq}")]
     public abstract class TagHelperDescriptor : IEquatable<TagHelperDescriptor>
     {
         private IEnumerable<RazorDiagnostic> _allDiagnostics;
@@ -68,6 +66,11 @@ namespace Microsoft.AspNetCore.Razor.Language
             return _allDiagnostics;
         }
 
+        public override string ToString()
+        {
+            return DisplayName ?? base.ToString();
+        }
+
         public bool Equals(TagHelperDescriptor other)
         {
             return TagHelperDescriptorComparer.Default.Equals(this, other);

src/Microsoft.AspNetCore.Razor.Runtime/TagHelpers/DefaultTagHelperContent.cs

@@ -14,7 +14,7 @@ namespace Microsoft.AspNetCore.Razor.TagHelpers
     /// <summary>
     /// Default concrete <see cref="TagHelperContent"/>.
     /// </summary>
-    [DebuggerDisplay("{DebuggerToString(),nq}")]
+    [DebuggerDisplay("{" + nameof(DebuggerToString) + "(),nq}")]
     public class DefaultTagHelperContent : TagHelperContent
     {
         private object _singleContent;
@@ -325,6 +325,11 @@ namespace Microsoft.AspNetCore.Razor.TagHelpers
             return this;
         }
 
+        private string DebuggerToString()
+        {
+            return GetContent();
+        }
+        
         // Overrides Write(string) to find if the content written is empty/whitespace.
         private class EmptyOrWhiteSpaceWriter : TextWriter
         {