qr code c# asp.net R u n t i m e Ty p e I D , R e f l e c t i o n , a n d A t t r i b u t e s in C#

Create QR Code in C# R u n t i m e Ty p e I D , R e f l e c t i o n , a n d A t t r i b u t e s

R u n t i m e Ty p e I D , R e f l e c t i o n , a n d A t t r i b u t e s
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x = a; y = b; Show();
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PART I
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} // Overload Set public void Set(double a, double b) { ConsoleWrite("Inside Set(double, double) "); x = (int) a; y = (int) b; Show(); } public void Show() { ConsoleWriteLine("Values are x: {0}, y: {1}", x, y); } } class InvokeConsDemo { static void Main() { Type t = typeof(MyClass); int val; // Get constructor info ConstructorInfo[] ci = tGetConstructors(); ConsoleWriteLine("Available constructors: "); foreach(ConstructorInfo c in ci) { // Display return type and name ConsoleWrite(" " + tName + "("); // Display parameters ParameterInfo[] pi = cGetParameters(); for(int i=0; i < piLength; i++) { ConsoleWrite(pi[i]ParameterTypeName + " " + pi[i]Name); if(i+1 < piLength) ConsoleWrite(", "); } ConsoleWriteLine(")"); } ConsoleWriteLine(); // Find matching constructor int x; for(x=0; x < ciLength; x++) { ParameterInfo[] pi = ci[x]GetParameters(); if(piLength == 2) break; } if(x == ciLength) {
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Part I:
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The C# Language
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ConsoleWriteLine("No matching constructor found"); return; } else ConsoleWriteLine("Two-parameter constructor found\n"); // Construct the object object[] consargs = new object[2]; consargs[0] = 10; consargs[1] = 20; object reflectOb = ci[x]Invoke(consargs); ConsoleWriteLine("\nInvoking methods on reflectOb"); ConsoleWriteLine(); MethodInfo[] mi = tGetMethods(); // Invoke each method foreach(MethodInfo m in mi) { // Get the parameters ParameterInfo[] pi = mGetParameters(); if(mNameEquals("Set", StringComparisonOrdinal) && pi[0]ParameterType == typeof(int)) { // This is Set(int, int) object[] args = new object[2]; args[0] = 9; args[1] = 18; mInvoke(reflectOb, args); } else if(mNameEquals("Set", StringComparisonOrdinal) && pi[0]ParameterType == typeof(double)) { // This is Set(double, double) object[] args = new object[2]; args[0] = 112; args[1] = 234; mInvoke(reflectOb, args); } else if(mNameEquals("Sum", StringComparisonOrdinal)) { val = (int) mInvoke(reflectOb, null); ConsoleWriteLine("sum is " + val); } else if(mNameEquals("IsBetween", StringComparisonOrdinal)) { object[] args = new object[1]; args[0] = 14; if((bool) mInvoke(reflectOb, args)) ConsoleWriteLine("14 is between x and y"); } else if(mNameEquals("Show")) { mInvoke(reflectOb, null); } } } }
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R u n t i m e Ty p e I D , R e f l e c t i o n , a n d A t t r i b u t e s
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Available constructors: MyClass(Int32 i) MyClass(Int32 i, Int32 j) Two-parameter constructor found Constructing MyClass(int, int) Values are x: 10, y: 20 Invoking methods on reflectOb sum is 30 14 is between x and y Inside Set(int, int) Values are x: 9, y: 18 Inside Set(double, double) Values are x: 1, y: 23 Values are x: 1, y: 23
PART I
Let s look at how reflection is used to construct a MyClass object First, a list of the public constructors is obtained using the following statement:
ConstructorInfo[] ci = tGetConstructors();
Next, for the sake of illustration, the constructors are displayed Then the list is searched for a constructor that takes two arguments, using this code:
for(x=0; x < ciLength; x++) { ParameterInfo[] pi = ci[x]GetParameters(); if(piLength == 2) break; }
If the constructor is found (as it will be in this case), an object is instantiated by the following sequence:
// Construct the object object[] consargs = new object[2]; consargs[0] = 10; consargs[1] = 20; object reflectOb = ci[x]Invoke(consargs);
After the call to Invoke( ), reflectOb will refer to an object of type MyClass The program then executes methods on that instance One important point needs to be made In this example, for the sake of simplicity, it was assumed that the only two-argument constructor was one that took two int arguments Obviously, in real-world code this would need to be verified by checking the parameter type of each argument
Obtaining Types from Assemblies
In the preceding example, everything about MyClass has been discovered using reflection except for one item: the type MyClass, itself That is, although the preceding examples dynamically determined information about MyClass, they still relied upon the fact that the
Part I:
The C# Language
type name MyClass was known in advance and used in a typeof statement to obtain a Type object upon which all of the reflection methods either directly or indirectly operated Although this might be useful in a number of circumstances, the full power of reflection is found when the types available to a program are determined dynamically by analyzing the contents of other assemblies As you know from 16, an assembly carries with it type information about the classes, structures, and so on, that it contains The Reflection API allows you to load an assembly, discover information about it, and create instances of any of its publicly available types Using this mechanism, a program can search its environment, utilizing functionality that might be available without having to explicitly define that functionality at compile time This is an extremely potent, and exciting, concept For example, you can imagine a program that acts as a type browser, displaying the types available on a system Another application could be a design tool that lets you visually wire together a program that is composed of the various types supported by the system Since all information about a type is discoverable, there is no inherent limitation to the ways reflection can be applied To obtain information about an assembly, you will first create an Assembly object The Assembly class does not define a public constructor Instead, an Assembly object is obtained by calling one of its methods The one we will use is LoadFrom( ), which loads an assembly given its filename The form we will use is shown here: static Assembly LoadFrom(string assemblyFile) Here, assemblyFile specifies the filename of the assembly Once you have obtained an Assembly object, you can discover the types that it defines by calling GetTypes( ) on it Here is its general form: Type[ ] GetTypes( ) It returns an array of the types contained in the assembly To demonstrate the discovery of types in an assembly, you will need two files The first will contain a set of classes that will be discovered by the second To begin, create a file called MyClassescs that contains the following:
// A file that contains three classes Call this file MyClassescs using System; class MyClass { int x; int y; public MyClass(int i) { ConsoleWriteLine("Constructing MyClass(int) "); x = y = i; Show(); } public MyClass(int i, int j) { ConsoleWriteLine("Constructing MyClass(int, int) "); x = i; y = j;
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