How Can Enums Be Dynamically Generated from a Database Lookup Table?
Jan 12, 2025 am 06:50 AMDynamically generate enumerations from database lookup table
How to automatically generate enumerations based on values ??stored in a database lookup table and keep the enumerations in sync with the database without manually modifying the code? This is a common question.
Code generation solutions
While it cannot be fully automated, code generation can provide a solution. Automatic generation of enumerations can be achieved by creating a separate project called "EnumeratedTypes" in the solution. This project acts as a console application, retrieving values ??from the database, constructing enumerations from those values, and saving them into a separate assembly.
In this code generation project, use the following code to define and populate dynamic enumerations:
// 創(chuàng)建動(dòng)態(tài)程序集 AssemblyName name = new AssemblyName("MyEnums"); AssemblyBuilder assemblyBuilder = currentDomain.DefineDynamicAssembly(name, AssemblyBuilderAccess.RunAndSave); // 定義動(dòng)態(tài)模塊 ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule(name.Name, name.Name + ".dll"); // 定義公共枚舉 EnumBuilder myEnum = moduleBuilder.DefineEnum("EnumeratedTypes.MyEnum", TypeAttributes.Public, typeof(int)); // 從數(shù)據(jù)庫檢索數(shù)據(jù) MyDataAdapter someAdapter = new MyDataAdapter(); MyDataSet.MyDataTable myData = myDataAdapter.GetMyData(); // 定義枚舉文字 foreach (MyDataSet.MyDataRow row in myData.Rows) { myEnum.DefineLiteral(row.Name, row.Key); } // 創(chuàng)建枚舉并保存程序集 myEnum.CreateType(); assemblyBuilder.Save(name.Name + ".dll");
Other projects in the solution can reference this generated assembly, thereby accessing dynamic enumerations and providing IntelliSense support.
Post-build event automation
To ensure automatic generation of enumerations, the "EnumeratedTypes" project can add a post-build event. This event will run during the build process and generate the "MyEnums.dll" file.
Other notes
- Modify the build order to ensure that the "EnumeratedTypes" project is built first to prevent build failure if "MyEnums.dll" is deleted.
- Refer to the MSDN article for further details on dynamic code generation.
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