Fixed: Test for empty strings using isNullOrEmpty

.editorconfig

@@ -185,8 +185,6 @@ dotnet_diagnostic.CA1814.severity = suggestion
 dotnet_diagnostic.CA1815.severity = suggestion
 dotnet_diagnostic.CA1816.severity = suggestion
 dotnet_diagnostic.CA1819.severity = suggestion
-dotnet_diagnostic.CA1820.severity = suggestion
-dotnet_diagnostic.CA1821.severity = suggestion
 dotnet_diagnostic.CA1822.severity = suggestion
 dotnet_diagnostic.CA1823.severity = suggestion
 dotnet_diagnostic.CA1824.severity = suggestion

src/NzbDrone.Common/OAuth/OAuthRequest.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Collections.Specialized;
 using System.Linq;
@@ -488,7 +488,7 @@ namespace NzbDrone.Common.OAuth
 
         private static bool IsNullOrBlank(string value)
         {
-            return string.IsNullOrEmpty(value) || (!string.IsNullOrEmpty(value) && value.Trim() == string.Empty);
+            return string.IsNullOrEmpty(value) || (!string.IsNullOrEmpty(value) && string.IsNullOrEmpty(value.Trim()));
         }
     }
 }

src/NzbDrone.Common/OAuth/OAuthTools.cs

@@ -405,7 +405,7 @@ namespace NzbDrone.Common.OAuth
 
         private static bool IsNullOrBlank(string value)
         {
-            return string.IsNullOrEmpty(value) || (!string.IsNullOrEmpty(value) && value.Trim() == string.Empty);
+            return string.IsNullOrEmpty(value) || (!string.IsNullOrEmpty(value) && string.IsNullOrEmpty(value.Trim()));
         }
     }
 }

src/NzbDrone.Common/TinyIoC.cs

@@ -3660,7 +3660,7 @@ namespace TinyIoC
             var registrations = _RegisteredTypes.Keys.Where(tr => tr.Type == resolveType).Concat(GetParentRegistrationsForType(resolveType));
 
             if (!includeUnnamed)
-                registrations = registrations.Where(tr => tr.Name != string.Empty);
+                registrations = registrations.Where(tr => !string.IsNullOrEmpty(tr.Name));
 
             return registrations.Select(registration => this.ResolveInternal(registration, NamedParameterOverloads.Default, ResolveOptions.Default));
         }

src/NzbDrone.Core/Datastore/Migration/149_convert_regex_required_tags.cs

@@ -1,4 +1,4 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.Data;
 using System.Linq;
 using System.Text.RegularExpressions;
@@ -40,7 +40,7 @@ namespace NzbDrone.Core.Datastore.Migration
                     modifiers += "RQ";
                 }
 
-                if (modifiers != "")
+                if (!string.IsNullOrEmpty(modifiers))
                 {
                     modifiers = "_" + modifiers;
                 }

src/NzbDrone.Core/Extras/Metadata/Consumers/Xbmc/XbmcMetadata.cs

@@ -305,7 +305,7 @@ namespace NzbDrone.Core.Extras.Metadata.Consumers.Xbmc
 
             var metadataFileName = GetMovieMetadataFilename(movieFile.RelativePath);
 
-            return xmlResult == string.Empty ? null : new MetadataFileResult(metadataFileName, xmlResult.Trim(Environment.NewLine.ToCharArray()));
+            return string.IsNullOrEmpty(xmlResult) ? null : new MetadataFileResult(metadataFileName, xmlResult.Trim(Environment.NewLine.ToCharArray()));
         }
 
         public override List<ImageFileResult> MovieImages(Movie movie)

src/NzbDrone.Core/MediaFiles/MediaInfo/MediaInfoFormatter.cs

@@ -348,7 +348,7 @@ namespace NzbDrone.Core.MediaFiles.MediaInfo
                     return ""; // Other
                 }
 
-                if (videoCodecLibrary == "")
+                if (string.IsNullOrEmpty(videoCodecLibrary))
                 {
                     return ""; // Unknown mp4v
                 }

src/NzbDrone.Core/Parser/IsoLanguages.cs

@@ -48,7 +48,7 @@ namespace NzbDrone.Core.Parser
                 if (isoArray.Length > 1)
                 {
                     isoLanguages = isoLanguages.Any(l => l.CountryCode == isoArray[1].ToLower()) ?
-                        isoLanguages.Where(l => l.CountryCode == isoArray[1].ToLower()).ToList() : isoLanguages.Where(l => l.CountryCode == "").ToList();
+                        isoLanguages.Where(l => l.CountryCode == isoArray[1].ToLower()).ToList() : isoLanguages.Where(l => string.IsNullOrEmpty(l.CountryCode)).ToList();
                 }
 
                 return isoLanguages.FirstOrDefault();

src/NzbDrone.Mono/Disk/SymbolicLinkResolver.cs

@@ -55,7 +55,7 @@ namespace NzbDrone.Mono.Disk
             var target = 0;
             for (var i = 0; i < dirs.Length; ++i)
             {
-                if (dirs[i] == "." || dirs[i] == string.Empty)
+                if (dirs[i] == "." || string.IsNullOrEmpty(dirs[i]))
                 {
                     continue;
                 }