diff --git a/src/Zaabee.Extensions/Zaabee.Extensions.Bool.cs b/src/Zaabee.Extensions/Zaabee.Extensions.Bool.cs
index 06f9959..f5d4e9b 100644
--- a/src/Zaabee.Extensions/Zaabee.Extensions.Bool.cs
+++ b/src/Zaabee.Extensions/Zaabee.Extensions.Bool.cs
@@ -24,10 +24,10 @@ public static void IfFalse(this bool b, Action action)
         if (!b) action();
     }
 
-    public static TResult? IfTrue<TResult>(this bool b, Func<TResult> func) =>
+    public static TResult? IfTrue<TResult>(this bool b, Func<TResult?> func) =>
         b ? func() : default;
 
-    public static TResult? IfFalse<TResult>(this bool b, Func<TResult> func) =>
+    public static TResult? IfFalse<TResult>(this bool b, Func<TResult?> func) =>
         !b ? func() : default;
 
     public static void IfTrueElse(this bool b, Action actionTrue, Action actionElse)
@@ -42,9 +42,9 @@ public static void IfFalseElse(this bool b, Action actionFalse, Action actionEls
         else actionElse();
     }
 
-    public static TResult? IfTrueElse<TResult>(this bool b, Func<TResult> funcTrue, Func<TResult> funcElse) =>
+    public static TResult? IfTrueElse<TResult>(this bool b, Func<TResult?> funcTrue, Func<TResult?> funcElse) =>
         b ? funcTrue() : funcElse();
 
-    public static TResult? IfFalseElse<TResult>(this bool b, Func<TResult> funcFalse, Func<TResult> funcElse) =>
+    public static TResult? IfFalseElse<TResult>(this bool b, Func<TResult?> funcFalse, Func<TResult?> funcElse) =>
         !b ? funcFalse() : funcElse();
 }
\ No newline at end of file
diff --git a/src/Zaabee.Extensions/Zaabee.Extensions.Stream.Read.Async.cs b/src/Zaabee.Extensions/Zaabee.Extensions.Stream.Read.Async.cs
index f153bf5..7525a56 100644
--- a/src/Zaabee.Extensions/Zaabee.Extensions.Stream.Read.Async.cs
+++ b/src/Zaabee.Extensions/Zaabee.Extensions.Stream.Read.Async.cs
@@ -35,14 +35,11 @@ public static async Task<byte[]> ReadToEndAsync(this Stream? stream, Cancellatio
             default:
 #if NETSTANDARD2_0
                 using (var memoryStream = new MemoryStream())
-#else
-                await using (var memoryStream = new MemoryStream())
-#endif
                 {
-
-#if NETSTANDARD2_0
                     await stream.CopyToAsync(memoryStream);
 #else
+                await using (var memoryStream = new MemoryStream())
+                {
                     await stream.CopyToAsync(memoryStream, cancellationToken);
 #endif
                     return memoryStream.ToArray();
diff --git a/src/Zaabee.Extensions/Zaabee.Extensions.Stream.Write.Async.cs b/src/Zaabee.Extensions/Zaabee.Extensions.Stream.Write.Async.cs
index fd5b6b5..c3e7982 100644
--- a/src/Zaabee.Extensions/Zaabee.Extensions.Stream.Write.Async.cs
+++ b/src/Zaabee.Extensions/Zaabee.Extensions.Stream.Write.Async.cs
@@ -10,7 +10,11 @@ public static async Task<bool> TryWriteAsync(this Stream? stream, byte[] buffer,
         CancellationToken cancellationToken = default)
     {
         var canWrite = stream is not null && stream.CanWrite;
+#if NETSTANDARD2_0
         if (canWrite) await stream!.WriteAsync(buffer, offset, count, cancellationToken);
+#else
+        if (canWrite) await stream!.WriteAsync(buffer.AsMemory(offset, count), cancellationToken);
+#endif
         return canWrite;
     }
 }
\ No newline at end of file
diff --git a/src/Zaabee.Extensions/Zaabee.Extensions.String.cs b/src/Zaabee.Extensions/Zaabee.Extensions.String.cs
index f837e58..2da651e 100644
--- a/src/Zaabee.Extensions/Zaabee.Extensions.String.cs
+++ b/src/Zaabee.Extensions/Zaabee.Extensions.String.cs
@@ -10,8 +10,11 @@ public static string TrimStart(this string target, string? trimString)
 
         var result = target;
         while (result.StartsWith(trimString))
+#if NETSTANDARD2_0
             result = result.Substring(trimString!.Length);
-
+#else
+            result = result[trimString.Length..];
+#endif
         return result;
     }
 
@@ -21,7 +24,11 @@ public static string TrimEnd(this string target, string? trimString)
 
         var result = target;
         while (result.EndsWith(trimString))
+#if NETSTANDARD2_0
             result = result.Substring(0, result.Length - trimString!.Length);
+#else
+            result = result[..^trimString.Length];
+#endif
 
         return result;
     }
@@ -39,7 +46,7 @@ public static string Format(this string format, params object[] args) =>
         string.Format(format, args);
 
     public static string GetLetterOrDigit(this string source) =>
-        new string(source.Where(char.IsLetterOrDigit).ToArray());
+        new(source.Where(char.IsLetterOrDigit).ToArray());
 
     public static string? TryReplace(this string? str, string oldValue, string? newValue) =>
         string.IsNullOrEmpty(str) ? str : str!.Replace(oldValue, newValue);
diff --git a/src/Zaabee.Extensions/Zaabee.Extensions.csproj b/src/Zaabee.Extensions/Zaabee.Extensions.csproj
index c02ede9..28fa72f 100644
--- a/src/Zaabee.Extensions/Zaabee.Extensions.csproj
+++ b/src/Zaabee.Extensions/Zaabee.Extensions.csproj
@@ -3,8 +3,8 @@
     <PropertyGroup>
         <TargetFrameworks>netstandard2.0;netcoreapp3.1;net5.0;net6.0</TargetFrameworks>
         <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
-        <PackageVersion>2021.14.0</PackageVersion>
-        <Version>2021.14.0</Version>
+        <PackageVersion>2022.1.0</PackageVersion>
+        <Version>2022.1.0</Version>
         <Authors>Mutuduxf</Authors>
         <Company>Mutuduxf</Company>
         <PackageTags>Zaabee;Extensions</PackageTags>