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This example uses the Hashtable, which most applications already contain references to because the mscorlib assembly is required by nearly every .NET application. The usual case for creating dynamic code is when you need to load code that you have not referenced in your application.
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' VB Dim tbl As New Hashtable() tbl.Add("Hi", "Hello") Console.WriteLine("Hash count: {0}", tbl.Count) // C# Hashtable tbl = new Hashtable(); tbl.Add("Hi", "Hello"); Console.WriteLine("Hash count: {0}", tbl.Count);
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Lesson 4: Writing Dynamic Code
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Creating Objects
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You can create this same code dynamically by using the type information you can gather with reflection. The first step is getting the type information, as you did in Lesson 3:
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' VB Dim path As String = "C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\" + _ "mscorlib.dll" ' Get the assembly Dim theAssembly As Assembly = Assembly.LoadFile(path) ' Get the Hashtable type Dim hashType As Type = theAssembly.GetType("System.Collections.Hashtable") // C# string path = @"C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\" + "mscorlib.dll"; // Get the assembly Assembly theAssembly = Assembly.LoadFile(path); // Get the Hashtable type Type hashType = theAssembly.GetType("System.Collections.Hashtable");
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Once you have the type, you can ask it for a ConstructorInfo object to use to construct your new type:
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' VB Dim argumentTypes() As Type = Type.EmptyTypes ' Empty Constructor Dim ctor As ConstructorInfo = hashType.GetConstructor(argumentTypes) // C# Type[] argumentTypes = Type.EmptyTypes; // Empty Constructor ConstructorInfo ctor = hashType.GetConstructor(argumentTypes);
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The ConstructorInfo object is a specialized MethodBase object that looks and acts like a typical method but always returns an instance of a specific type. In this example, you are asking the Type class to return an empty constructor. (You are supplying an empty Array of Types to specify the empty constructor.) You could also ask for a constructor with specific arguments by supplying an array of the constructor argument types, like so:
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' VB Dim argumentTypes() As Type = _ New Type() {GetType(System.Int32)} ' One argument of type Int32 Dim ctor As ConstructorInfo = hashType.GetConstructor(argumentTypes) // C# Type[] argumentTypes = new Type[] { typeof(int) }; // One argument of type int ConstructorInfo ctor = hashType.GetConstructor(argumentTypes);
14
Reflection
Once you have the ConstructorInfo object, creating an object is as simple as invoking the constructor. Here is how to invoke the empty constructor:
' VB Dim newHash as Object = ctor.Invoke(New Object() {}) // C# object newHash = ctor.Invoke(new object[] {});
Invoking Members
Once you have an instance of an object, you simply use reflection to get the info class you need to call, and then you invoke the info class to execute the code. For example, call the Add method on your new Hashtable instance:
' VB Dim meth As MethodInfo = hashType.GetMethod("Add") meth.Invoke(newHash, New Object() {"Hi", "Hello"}) // C# MethodInfo meth = hashType.GetMethod("Add"); meth.Invoke(newHash, new object[] { "Hi", "Hello" });
The Invoke call on the MethodInfo class requires that you supply it with the object to invoke the member on and an array of parameters that match one of the overloads of the method. In this case, you are calling invoke on your dynamically created Hashtable and you are supplying the two arguments that allow you to add a key and value to the Hashtable. You can now use the PropertyInfo class to get the count of the items in your Hashtable to verify that the Add worked as you expected it to:
' VB Dim prop As PropertyInfo = hashType.GetProperty("Count") Dim count As Integer = CType(prop.GetValue(newHash, Nothing),Integer) // C# PropertyInfo prop = hashType.GetProperty("Count"); int count = (int) prop.GetValue(newHash, null);
The PropertyInfo class supports getting or setting an individual property. In this case, you are calling the GetValue method of the PropertyInfo class to get the value of the Count property. When calling the GetValue method, it works much like the Invoke call shown previously. It requires that you specify an object on which to call the Get method and that you specify any parameters. Parameters are supplied only for indexer properties.
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