C # dynamically create a type during running,

C # dynamically create a type during running,

C # The dynamic creation type at runtime. Here, the C # source code is dynamically generated, and then the dynamic creation type is implemented by compiling the compiler into an assembly.

Public static Assembly NewAssembly () {// create a compiler instance. Provider = new CSharpCodeProvider (); // set the compilation parameters. Cp = new CompilerParameters (); cp. generateExecutable = false; cp. generateInMemory = true; // Generate an executable instead of // a class library. // cp. generateExecutable = true; // Set the assembly file name to generate. cp. outputAssembly = "c: \ 1.dll"; // Generate debug information. cp. includeDebugInformation = true; // Save the assembly as a physical file. cp. generateInMemory = false; // Set th E level at which the compiler // shocould start displaying warnings. cp. warningLevel = 3; // Set whether to treat all warnings as errors. cp. treatWarningsAsErrors = false; // Set compiler argument to optimize output. cp. compilerOptions = "/optimize"; cp. referencedAssemblies. add ("System. dll "); // cp. referencedAssemblies. add ("System. core. dll "); cp. referencedAssemblies. add ("System. data. dll "); // cp. refer EncedAssemblies. add ("System. data. dataSetExtensions. dll "); cp. referencedAssemblies. add ("System. deployment. dll "); cp. referencedAssemblies. add ("System. design. dll "); cp. referencedAssemblies. add ("System. drawing. dll "); cp. referencedAssemblies. add ("System. windows. forms. dll "); // create dynamic code. StringBuilder classSource = new StringBuilder (); classSource. append ("using System; using System. windows. forms; \ npublic class DynamicClass: UserControl \ n "); classSource. append ("{\ n"); classSource. append ("public DynamicClass () \ n {\ nInitializeComponent (); \ nConsole. writeLine (\ "hello \") ;}\ n "); classSource. append ("private System. componentModel. IContainer components = null; \ nprotected override void Dispo Se (bool disposing) \ n {\ n "); classSource. Append (" if (disposing & (components! = Null) {components. dispose ();} base. dispose (disposing); \ n} \ n "); classSource. append ("private void InitializeComponent () {\ nthis. suspendLayout (); this. autoScaleDimensions = new System. drawing. sizeF (6F, 12F); "); classSource. append ("this. autoScaleMode = System. windows. forms. autoScaleMode. font; this. name = \ "DynamicClass \"; this. size = new System. drawing. size (112, 74); this. resumeLayout (false); \ n} "); // create a genus. ******** * *********************/ClassSource. append (propertyString ("aaa"); classSource. append (propertyString ("bbb"); classSource. append (propertyString ("ccc"); classSource. append ("}"); System. diagnostics. debug. writeLine (classSource. toString (); // compile the code. CompilerResults result = provider. compileAssemblyFromSource (cp, classSource. toString (); if (result. errors. count> 0) {for (int I = 0; I <result. errors. count; I ++) Console. writeLine (result. errors [I]); Console. writeLine ("error"); return null;} // gets the compiled assembly. Assembly assembly = result. compiledAssembly; return assembly;} private static string propertyString (string propertyName) {StringBuilder sbProperty = new StringBuilder (); sbProperty. append ("private int _" + propertyName + "= 0; \ n"); sbProperty. append ("public int" + "+ propertyName +" \ n "); sbProperty. append ("{\ n"); sbProperty. append ("get {return _" + propertyName + ";}\ n"); sbProperty. append ("set {_" + propertyName + "= value ;}\ n"); sbProperty. append ("}"); return sbProperty. toString ();}

C Language & |! What are

& Is the address fetch operator used to extract the address of a variable.
For example, if you define a variable, the system will allocate a space in the memory during compilation.
The location of the space in the memory is its address. & Extract its address.
E. g int a; assign an address to it during compilation, for example, 2000; & a is 2000.
If an integer pointer Variable p, p = & a; is defined, the address 2000 of a is assigned to p. P = 2000 after running.
Another example is scanf ("% d", & a). When you enter 3, it first knows the address of a according to & a, and finds the space of a in the memory by the address, write 3 to this space.
* Is a pointer operator, which is opposite to &. It extracts the value of a Variable Based on the address of the variable.
For example, * the value of a is 3 of variable.
The following is a summary of the pointer used in the definition and description.
Int * p; defines a pointer to integer data.
Int * p [n]; defines the pointer array p, which consists of n pointer elements pointing to integer data.
Int (* p) [n]; p is the pointer variable pointing to a one-dimensional array containing n elements.
Int * p (); p is the function that returns a pointer pointing to integer data.
Int (* p) (); p is the pointer to the function. This function returns an integer value.
Int ** p; p is a pointer variable that points to an integer Data Pointer variable.
If you want to learn more about the system, you can refer to tan haoqiang's c Programming (the third edition), which is easy to understand. Is a good C language learning material.

C Language & |! What are

& Is the address fetch operator used to extract the address of a variable.
For example, if you define a variable, the system will allocate a space in the memory during compilation.
The location of the space in the memory is its address. & Extract its address.
E. g int a; assign an address to it during compilation, for example, 2000; & a is 2000.
If an integer pointer Variable p, p = & a; is defined, the address 2000 of a is assigned to p. P = 2000 after running.
Another example is scanf ("% d", & a). When you enter 3, it first knows the address of a according to & a, and finds the space of a in the memory by the address, write 3 to this space.
* Is a pointer operator, which is opposite to &. It extracts the value of a Variable Based on the address of the variable.
For example, * the value of a is 3 of variable.
The following is a summary of the pointer used in the definition and description.
Int * p; defines a pointer to integer data.
Int * p [n]; defines the pointer array p, which consists of n pointer elements pointing to integer data.
Int (* p) [n]; p is the pointer variable pointing to a one-dimensional array containing n elements.
Int * p (); p is the function that returns a pointer pointing to integer data.
Int (* p) (); p is the pointer to the function. This function returns an integer value.
Int ** p; p is a pointer variable that points to an integer Data Pointer variable.
If you want to learn more about the system, you can refer to tan haoqiang's c Programming (the third edition), which is easy to understand. Is a good C language learning material.