diff --git a/appveyor.yml b/appveyor.yml
index 81ad853de..cc128af4a 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -35,16 +35,10 @@ before_build:
 - ps: $NTP = Start-Process node ntp.js -PassThru
 - dotnet restore -v Minimal
 - cmd: mkdir tools
-- cmd: nuget install coveralls.net -Version 0.7.0 -OutputDirectory tools
 build_script:
 - msbuild /p:Configuration=Release /verbosity:quiet
 test_script:
-- dotnet test /p:CollectCoverage=true /p:CoverletOutputFormat=opencover /p:Exclude=[NUnit3.TestAdapter]* test/Swan.Test/Swan.Test.csproj -c Release
-- ps: |
-        if(-Not $env:APPVEYOR_PULL_REQUEST_TITLE -And $isWindows)
-        {
-            tools\coveralls.net.0.7.0\tools\csmacnz.Coveralls.exe --opencover -i test\Swan.Test\coverage.opencover.xml --serviceName appveyor --jobId $Env:APPVEYOR_BUILD_NUMBER
-        }
+- dotnet test test/Swan.Test/Swan.Test.csproj -c Release
 after_build:
 - ps: |
         if(-Not $env:APPVEYOR_PULL_REQUEST_TITLE -And $isWindows -And $env:APPVEYOR_REPO_BRANCH -eq "master")
diff --git a/src/Swan.Lite/Collections/IComponentCollection`1.cs b/src/Swan.Lite/Collections/IComponentCollection`1.cs
index a18c7340f..7edfdc2bd 100644
--- a/src/Swan.Lite/Collections/IComponentCollection`1.cs
+++ b/src/Swan.Lite/Collections/IComponentCollection`1.cs
@@ -8,6 +8,7 @@ namespace Swan.Collections
     /// <para>Each component in the collection may be given a unique name for later retrieval.</para>
     /// </summary>
     /// <typeparam name="T">The type of components in the collection.</typeparam>
+    [Obsolete("This interface will be removed in the next major version")]
     public interface IComponentCollection<T> : IReadOnlyList<T>
     {
         /// <summary>
diff --git a/src/Swan.Lite/Extensions.ByteArrays.cs b/src/Swan.Lite/Extensions.ByteArrays.cs
index 3888912c4..bd025ce38 100644
--- a/src/Swan.Lite/Extensions.ByteArrays.cs
+++ b/src/Swan.Lite/Extensions.ByteArrays.cs
@@ -125,7 +125,7 @@ public static byte SetBitValueAt(this byte @this, byte offset, byte length, byte
         /// <returns>
         /// A byte array containing the results the specified sequence of bytes.
         /// </returns>
-        /// <exception cref="System.ArgumentNullException">
+        /// <exception cref="ArgumentNullException">
         /// buffer
         /// or
         /// sequence.
@@ -172,7 +172,7 @@ public static List<byte[]> Split(this byte[] @this, int offset, params byte[] se
         /// <returns>
         /// A byte array containing the results of encoding the specified set of characters.
         /// </returns>
-        /// <exception cref="System.ArgumentNullException">this</exception>
+        /// <exception cref="ArgumentNullException">this</exception>
         public static byte[] DeepClone(this byte[] @this)
         {
             if (@this == null)
@@ -398,14 +398,17 @@ public static MemoryStream Append(this MemoryStream stream, IEnumerable<byte[]>
         /// </summary>
         /// <param name="buffer">The buffer.</param>
         /// <param name="encoding">The encoding.</param>
-        /// <returns>A <see cref="System.String" /> that contains the results of decoding the specified sequence of bytes.</returns>
-        public static string ToText(this IEnumerable<byte> buffer, Encoding encoding) => encoding.GetString(buffer.ToArray());
+        /// <returns>A <see cref="string" /> that contains the results of decoding the specified sequence of bytes.</returns>
+        public static string ToText(this IEnumerable<byte> buffer, Encoding encoding) =>
+            encoding == null
+                ? throw new ArgumentNullException(nameof(encoding))
+                : encoding.GetString(buffer.ToArray());
 
         /// <summary>
         /// Converts an array of bytes into text with UTF8 encoding.
         /// </summary>
         /// <param name="buffer">The buffer.</param>
-        /// <returns>A <see cref="System.String" /> that contains the results of decoding the specified sequence of bytes.</returns>
+        /// <returns>A <see cref="string" /> that contains the results of decoding the specified sequence of bytes.</returns>
         public static string ToText(this IEnumerable<byte> buffer) => buffer.ToText(Encoding.UTF8);
         
         /// <summary>
@@ -424,31 +427,32 @@ public static async Task<byte[]> ReadBytesAsync(this Stream stream, long length,
             if (stream == null)
                 throw new ArgumentNullException(nameof(stream));
 
-            using (var dest = new MemoryStream())
+            using var dest = new MemoryStream();
+
+            try
             {
-                try
-                {
-                    var buff = new byte[bufferLength];
-                    while (length > 0)
-                    {
-                        if (length < bufferLength)
-                            bufferLength = (int)length;
-
-                        var nread = await stream.ReadAsync(buff, 0, bufferLength, cancellationToken).ConfigureAwait(false);
-                        if (nread == 0)
-                            break;
-
-                        dest.Write(buff, 0, nread);
-                        length -= nread;
-                    }
-                }
-                catch
+                var buff = new byte[bufferLength];
+                while (length > 0)
                 {
-                    // ignored
-                }
+                    if (length < bufferLength)
+                        bufferLength = (int)length;
+
+                    var read = await stream.ReadAsync(buff, 0, bufferLength, cancellationToken).ConfigureAwait(false);
+                    if (read == 0)
+                        break;
 
-                return dest.ToArray();
+                    dest.Write(buff, 0, read);
+                    length -= read;
+                }
+            }
+#pragma warning disable CA1031 // Do not catch general exception types
+            catch
+#pragma warning restore CA1031 // Do not catch general exception types
+            {
+                // ignored
             }
+
+            return dest.ToArray();
         }
 
         /// <summary>
@@ -468,19 +472,22 @@ public static async Task<byte[]> ReadBytesAsync(this Stream stream, int length,
 
             var buff = new byte[length];
             var offset = 0;
+
             try
             {
                 while (length > 0)
                 {
-                    var nread = await stream.ReadAsync(buff, offset, length, cancellationToken).ConfigureAwait(false);
-                    if (nread == 0)
+                    var read = await stream.ReadAsync(buff, offset, length, cancellationToken).ConfigureAwait(false);
+                    if (read == 0)
                         break;
 
-                    offset += nread;
-                    length -= nread;
+                    offset += read;
+                    length -= read;
                 }
             }
+#pragma warning disable CA1031 // Do not catch general exception types
             catch
+#pragma warning restore CA1031 // Do not catch general exception types
             {
                 // ignored
             }
diff --git a/src/Swan/DependencyInjection/DependencyContainerRegistrationException.cs b/src/Swan/DependencyInjection/DependencyContainerRegistrationException.cs
index 389074493..bed99f2da 100644
--- a/src/Swan/DependencyInjection/DependencyContainerRegistrationException.cs
+++ b/src/Swan/DependencyInjection/DependencyContainerRegistrationException.cs
@@ -8,6 +8,7 @@
     /// Generic Constraint Registration Exception.
     /// </summary>
     /// <seealso cref="Exception" />
+    [Serializable]
     public class DependencyContainerRegistrationException : Exception
     {
         private const string ConvertErrorText = "Cannot convert current registration of {0} to {1}";
@@ -38,9 +39,6 @@ public DependencyContainerRegistrationException(Type type, string method, bool i
         {
         }
 
-        private static string GetTypesString(IEnumerable<Type> types)
-        {
-            return string.Join(",", types.Select(type => type.FullName));
-        }
+        private static string GetTypesString(IEnumerable<Type> types) => string.Join(",", types.Select(type => type.FullName));
     }
 }
\ No newline at end of file
diff --git a/test/Swan.Test/CsvWriterTest.cs b/test/Swan.Test/CsvWriterTest.cs
index 178b528ca..61bf9f768 100644
--- a/test/Swan.Test/CsvWriterTest.cs
+++ b/test/Swan.Test/CsvWriterTest.cs
@@ -79,11 +79,9 @@ public void TempFileFilled_SetStreamLengthToZero()
 
             using (var stream = File.OpenWrite(tempFile))
             {
-                using (var writer = new CsvWriter(stream))
-                {
-                    writer.WriteHeadings(data);
-                    writer.WriteObjects(new List<object> { data.Select(k => k.Key) });
-                }
+                using var writer = new CsvWriter(stream);
+                writer.WriteHeadings(data);
+                writer.WriteObjects(new List<object> { data.Select(k => k.Key) });
             }
 
             var valuesInFile = CsvReader.LoadRecords<object>(tempFile);
@@ -145,7 +143,7 @@ public void Strings_ReturnsAreEqual()
             using var writer = new CsvWriter(stream);
             writer.WriteObjects(strings);
 
-            Assert.AreEqual((int) writer.Count, strings.Count);
+            Assert.AreEqual((int)writer.Count, strings.Count);
         }
 
         [Test]
@@ -159,7 +157,7 @@ public void DynamicObject_ReturnsAreEqual()
             writer.WriteObject(dynObject);
 
             Assert.IsNotNull(writer);
-            Assert.AreEqual(1, (int) writer.Count);
+            Assert.AreEqual(1, (int)writer.Count);
         }
     }
 
@@ -181,7 +179,7 @@ public void NullDictionary_ThrowsArgumentNullException()
             using var stream = new MemoryStream();
             using var writer = new CsvWriter(stream);
 
-            Assert.Throws<ArgumentNullException>(() => 
+            Assert.Throws<ArgumentNullException>(() =>
                     writer.WriteHeadings(null as Dictionary<string, string>));
         }
 
@@ -245,7 +243,7 @@ public void WritingHeadersFromSampleClass_WritesHeaders()
         }
 
         [Test]
-        public void WriteHeadingNull ()
+        public void WriteHeadingNull()
         {
             using var stream = new MemoryStream();
             using var writer = new CsvWriter(stream);
@@ -295,9 +293,8 @@ public void ChangeSeparator()
             var objHeaders = new SampleCsvRecord();
 
             using var stream = new MemoryStream();
-            using var writer = new CsvWriter(stream);
+            using var writer = new CsvWriter(stream) {SeparatorCharacter = '#'};
 
-            writer.SeparatorCharacter = '#';
             writer.WriteHeadings(objHeaders);
 
             stream.Position = 0;