How to use C # To dynamically generate code

Frequently asked by friends about how to dynamically generateCode. This function is supported by the. NET Framework. The following is a simple example.

 

Private void generatecode (){

/* Note: import the following namespace first

Using system. codedom

Using system. codedom. compiler;

Using Microsoft. CSHARP;

Using system. reflection;

*/

// Prepare a code compiler Unit

Codecompileunit unit = new codecompileunit ();

// Prepare the necessary namespace (this refers to the space of the class to be generated)

Codenamespace samplenamespace = new codenamespace ("xizhang.com ");

// Import necessary namespaces

Samplenamespace. Imports. Add (New codenamespaceimport ("system "));

// Prepare the definition of the class to be generated

Codetypedeclaration customerclass = new codetypedeclaration ("customer ");

// Specify this is a class

Customerclass. isclass = true;

Customerclass. typeattributes = typeattributes. Public | typeattributes. sealed;

// Put this class under this namespace

Samplenamespace. types. Add (customerclass );

// Add the namespace to the namespace set of the compiler Unit

Unit. namespaces. Add (samplenamespace );

// This is the output file

String outputfile = "customer. cs ";

// Add a field

Codememberfield field = new codememberfield (typeof (system. String), "_ id ");

Field. Attributes = memberattributes. Private;

Customerclass. members. Add (field );

// Add attributes

Codememberproperty property = new codememberproperty ();

Property. Attributes = memberattributes. Public | memberattributes. Final;

Property. Name = "ID ";

Property. hasget = true;

Property. hasset = true;

Property. type = new codetypereference (typeof (system. String ));

Property. Comments. Add (New codecommentstatement ("this is the ID property "));

Property. getstatements. Add (New codemethodreturnstatement (New codefieldreferenceexpression (New codethisreferenceexpression (), "_ id ")));

Property. setstatements. Add (New codeassignstatement (New codefieldreferenceexpression (New codethisreferenceexpression (), "_ id"), new codepropertysetvaluereferenceexpression ()));

Customerclass. members. Add (property );

// Add method (use codemembermethod) -- omitted here

// Add the constructor (use codeconstructor) -- this is omitted

// AddProgramEntry Point (using codeentrypointmethod) -- omitted here

// Add an event (use codememberevent) -- this is omitted

// Add features (use codeattributedeclaration)

Customerclass. customattributes. Add (New codeattributedeclaration (New codetypereference (typeof (serializableattribute ))));

// Generate code

Codedomprovider provider = codedomprovider. createprovider ("CSHARP ");

Codegeneratoroptions Options = new codegeneratoroptions ();

Options. bracingstyle = "C ";

Options. blanklinesbetweenmembers = true;

Using (system. Io. streamwriter Sw = new system. Io. streamwriter (outputfile )){

Provider. generatecodefromcompileunit (unit, SW, options );

}

}

The final result is