✨Add null-check assertions and ExceptionExtensions for parameter va…

Directory.Build.props

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project>
   <PropertyGroup>
-    <Version>2025.12.12.1</Version>
+    <Version>2025.12.12.2</Version>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
     <LangVersion>preview</LangVersion>

src/libraries/TedToolkit.Assertions/AssertionExtensions.cs

@@ -1,4 +1,5 @@
-using System.Runtime.CompilerServices;
+using System.Diagnostics.CodeAnalysis;
+using System.Runtime.CompilerServices;
 using TedToolkit.Assertions.Assertions;
 using TedToolkit.Assertions.Constraints;
 
@@ -86,4 +87,60 @@ public static ObjectAssertion<T> Could<T>(this T value,
         return new ObjectAssertion<T>(value, valueName, AssertionType.Could,
             new CallerInfo(memberName, filePath, lineNumber));
     }
+
+    /// <summary>
+    ///     The must assertion with null check
+    /// </summary>
+    /// <param name="value"></param>
+    /// <param name="valueName"></param>
+    /// <param name="memberName"></param>
+    /// <param name="filePath"></param>
+    /// <param name="lineNumber"></param>
+    /// <typeparam name="T"></typeparam>
+    /// <returns></returns>
+    public static AndConstraint<T> MustNotNull<T>(
+        [NotNull] this T value,
+        [CallerArgumentExpression(nameof(value))]
+        string valueName = "",
+        [CallerMemberName] string memberName = "",
+        [CallerFilePath] string filePath = "",
+        [CallerLineNumber] int lineNumber = 0)
+        where T : class
+
+    {
+        ThrowIfInvalid(value);
+        return new(new ObjectAssertion<T>(
+            value.ThrowIfNull(valueName),
+            valueName,
+            AssertionType.Must,
+            new CallerInfo(memberName, filePath, lineNumber)));
+    }
+
+
+    /// <summary>
+    ///     The must assertion with null check
+    /// </summary>
+    /// <param name="value"></param>
+    /// <param name="valueName"></param>
+    /// <param name="memberName"></param>
+    /// <param name="filePath"></param>
+    /// <param name="lineNumber"></param>
+    /// <typeparam name="T"></typeparam>
+    /// <returns></returns>
+    public static AndConstraint<T> MustNotNull<T>(
+        [NotNull] this T? value,
+        [CallerArgumentExpression(nameof(value))]
+        string valueName = "",
+        [CallerMemberName] string memberName = "",
+        [CallerFilePath] string filePath = "",
+        [CallerLineNumber] int lineNumber = 0)
+        where T : struct
+    {
+        ThrowIfInvalid(value);
+        return new(new ObjectAssertion<T>(
+            value.ThrowIfNull(valueName),
+            valueName,
+            AssertionType.Must,
+            new CallerInfo(memberName, filePath, lineNumber)));
+    }
 }

src/libraries/TedToolkit.Assertions/ExceptionExtensions.cs

@@ -0,0 +1,41 @@
+using System.Diagnostics.CodeAnalysis;
+using System.Runtime.CompilerServices;
+
+namespace TedToolkit.Assertions;
+
+/// <summary>
+/// Some exceptions extensions.
+/// </summary>
+public static class ExceptionExtensions
+{
+    /// <summary>
+    /// Throw ArgumentNullException if obj is null.
+    /// </summary>
+    /// <param name="obj">The object</param>
+    /// <param name="objName">the name of obj</param>
+    /// <exception cref="ArgumentNullException">exceptions</exception>
+    [return: NotNull]
+    public static T ThrowIfNull<T>(
+        [NotNull] this T obj,
+        [CallerArgumentExpression(nameof(obj))]
+        string objName = "")
+        where T : class
+    {
+        return obj ?? throw new ArgumentNullException(objName);
+    }
+
+    /// <summary>
+    /// Throw ArgumentNullException if obj is null.
+    /// </summary>
+    /// <param name="obj">The object</param>
+    /// <param name="objName">the name of obj</param>
+    /// <exception cref="ArgumentNullException">exceptions</exception>
+    public static T ThrowIfNull<T>(
+        [NotNull] this T? obj,
+        [CallerArgumentExpression(nameof(obj))]
+        string objName = "")
+        where T : struct
+    {
+        return obj ?? throw new ArgumentNullException(objName);
+    }
+}