Move lengthy remarks for DynamicMethod to conceptual docs repo

docs/fundamentals/runtime-libraries/includes/context.md

@@ -1 +1,2 @@
-This article provides supplementary remarks to the reference documentation for this API.
+> [!NOTE]
+> This article provides supplementary remarks to the reference documentation for this API.

docs/fundamentals/runtime-libraries/snippets/System.Reflection.Emit/DynamicMethod/.ctor/csharp/Project.csproj

@@ -0,0 +1,8 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Library</OutputType>
+    <TargetFramework>net10.0</TargetFramework>
+  </PropertyGroup>
+
+</Project>

docs/fundamentals/runtime-libraries/snippets/System.Reflection.Emit/DynamicMethod/.ctor/csharp/source.cs

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+//<Snippet1>
+using System;
+using System.Reflection;
+using System.Reflection.Emit;
+
+// These classes are for demonstration purposes.
+//
+public class Example
+{
+    private int id = 0;
+    public Example(int id)
+    {
+        this.id = id;
+    }
+    public int ID { get { return id; }}
+}
+
+public class DerivedFromExample : Example
+{
+    public DerivedFromExample(int id) : base(id) {}
+}
+
+// Two delegates are declared: UseLikeInstance treats the dynamic
+// method as if it were an instance method, and UseLikeStatic
+// treats the dynamic method in the ordinary fashion.
+//
+public delegate int UseLikeInstance(int newID);
+public delegate int UseLikeStatic(Example ex, int newID);
+
+public class Demo
+{
+    public static void Main()
+    {
+        // This dynamic method changes the private id field. It has
+        // no name; it returns the old id value (return type int);
+        // it takes two parameters, an instance of Example and
+        // an int that is the new value of id; and it is declared
+        // with Example as the owner type, so it can access all
+        // members, public and private.
+        //
+        DynamicMethod changeID = new DynamicMethod(
+            "",
+            typeof(int),
+            new Type[] { typeof(Example), typeof(int) },
+            typeof(Example)
+        );
+
+        // Get a FieldInfo for the private field 'id'.
+        FieldInfo fid = typeof(Example).GetField(
+            "id",
+            BindingFlags.NonPublic | BindingFlags.Instance
+        );
+
+        ILGenerator ilg = changeID.GetILGenerator();
+
+        // Push the current value of the id field onto the
+        // evaluation stack. It's an instance field, so load the
+        // instance of Example before accessing the field.
+        ilg.Emit(OpCodes.Ldarg_0);
+        ilg.Emit(OpCodes.Ldfld, fid);
+
+        // Load the instance of Example again, load the new value
+        // of id, and store the new field value.
+        ilg.Emit(OpCodes.Ldarg_0);
+        ilg.Emit(OpCodes.Ldarg_1);
+        ilg.Emit(OpCodes.Stfld, fid);
+
+        // The original value of the id field is now the only
+        // thing on the stack, so return from the call.
+        ilg.Emit(OpCodes.Ret);
+
+        // Create a delegate that uses changeID in the ordinary
+        // way, as a static method that takes an instance of
+        // Example and an int.
+        //
+        UseLikeStatic uls =
+            (UseLikeStatic) changeID.CreateDelegate(
+                typeof(UseLikeStatic)
+            );
+
+        // Create an instance of Example with an id of 42.
+        //
+        Example ex = new Example(42);
+
+        // Create a delegate that is bound to the instance of
+        // of Example. This is possible because the first
+        // parameter of changeID is of type Example. The
+        // delegate has all the parameters of changeID except
+        // the first.
+        UseLikeInstance uli =
+            (UseLikeInstance) changeID.CreateDelegate(
+                typeof(UseLikeInstance),
+                ex
+            );
+
+        // First, change the value of id by calling changeID as
+        // a static method, passing in the instance of Example.
+        //
+        Console.WriteLine(
+            "Change the value of id; previous value: {0}",
+            uls(ex, 1492)
+        );
+
+        // Change the value of id again using the delegate bound
+        // to the instance of Example.
+        //
+        Console.WriteLine(
+            "Change the value of id; previous value: {0}",
+            uli(2700)
+        );
+
+        Console.WriteLine("Final value of id: {0}", ex.ID);
+
+        // Now repeat the process with a class that derives
+        // from Example.
+        //
+        DerivedFromExample dfex = new DerivedFromExample(71);
+
+        uli = (UseLikeInstance) changeID.CreateDelegate(
+                typeof(UseLikeInstance),
+                dfex
+            );
+
+        Console.WriteLine(
+            "Change the value of id; previous value: {0}",
+            uls(dfex, 73)
+        );
+        Console.WriteLine(
+            "Change the value of id; previous value: {0}",
+            uli(79)
+        );
+        Console.WriteLine("Final value of id: {0}", dfex.ID);
+    }
+}
+
+/* This code example produces the following output:
+
+Change the value of id; previous value: 42
+Change the value of id; previous value: 1492
+Final value of id: 2700
+Change the value of id; previous value: 71
+Change the value of id; previous value: 73
+Final value of id: 79
+ */
+//</Snippet1>

docs/fundamentals/runtime-libraries/snippets/System.Reflection.Emit/DynamicMethod/.ctor/csharp/source1.cs

@@ -0,0 +1,80 @@
+//<Snippet1>
+using System;
+using System.Reflection;
+using System.Reflection.Emit;
+
+public class Test
+{
+    // Declare a delegate that will be used to execute the completed
+    // dynamic method.
+    private delegate int HelloInvoker(string msg, int ret);
+
+    public static void Main()
+    {
+        // Create an array that specifies the types of the parameters
+        // of the dynamic method. This method has a string parameter
+        // and an int parameter.
+        Type[] helloArgs = {typeof(string), typeof(int)};
+
+        // Create a dynamic method with the name "Hello", a return type
+        // of int, and two parameters whose types are specified by the
+        // array helloArgs. Create the method in the module that
+        // defines the Test class.
+        DynamicMethod hello = new DynamicMethod("Hello",
+            typeof(int),
+            helloArgs,
+            typeof(Test).Module);
+
+        // <Snippet2>
+        // Create an array that specifies the parameter types of the
+        // overload of Console.WriteLine to be used in Hello.
+        Type[] writeStringArgs = {typeof(string)};
+        // Get the overload of Console.WriteLine that has one
+        // String parameter.
+        MethodInfo writeString =
+            typeof(Console).GetMethod("WriteLine", writeStringArgs);
+
+        // Get an ILGenerator and emit a body for the dynamic method.
+        ILGenerator il = hello.GetILGenerator();
+        // Load the first argument, which is a string, onto the stack.
+        il.Emit(OpCodes.Ldarg_0);
+        // Call the overload of Console.WriteLine that prints a string.
+        il.EmitCall(OpCodes.Call, writeString, null);
+        // The Hello method returns the value of the second argument;
+        // to do this, load the second argument onto the stack and return.
+        il.Emit(OpCodes.Ldarg_1);
+        il.Emit(OpCodes.Ret);
+        // </Snippet2>
+
+        // <Snippet3>
+        // Create a delegate that represents the dynamic method. This
+        // action completes the method. Further attempts to change the
+        // method are ignored and no exception is thrown.
+        HelloInvoker hi =
+            (HelloInvoker) hello.CreateDelegate(typeof(HelloInvoker));
+        // </Snippet3>
+
+        // Use the delegate to execute the dynamic method. Save and
+        // print the return value.
+        int retval = hi("\r\nHello, World!", 42);
+        Console.WriteLine("Executing delegate hi(\"Hello, World!\", 42) returned {0}",
+            retval);
+
+        // Do it again, with different arguments.
+        retval = hi("\r\nHi, Mom!", 5280);
+        Console.WriteLine("Executing delegate hi(\"Hi, Mom!\", 5280) returned {0}",
+            retval);
+
+        // <Snippet4>
+        // Create an array of arguments to use with the Invoke method.
+        object[] invokeArgs = {"\r\nHello, World!", 42};
+        // Invoke the dynamic method using the arguments. This is much
+        // slower than using the delegate, because you must create an
+        // array to contain the arguments, and ValueType arguments
+        // must be boxed.
+        object objRet = hello.Invoke(null, invokeArgs);
+        Console.WriteLine("hello.Invoke returned {0}", objRet);
+        // </Snippet4>
+    }
+}
+//</Snippet1>

docs/fundamentals/runtime-libraries/snippets/System.Reflection.Emit/DynamicMethod/.ctor/vb/Project.vbproj

@@ -0,0 +1,8 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Library</OutputType>
+    <TargetFramework>net10.0</TargetFramework>
+  </PropertyGroup>
+
+</Project>