如何创建自定义工具以在Visual Studio 2010中生成代码？

Question

I simply want to generate a class with attributes that comes from a Database table .

If I have a Database table like the following:

+-------------------+
| Id | Name         |
+----+--------------+
| 1  + foo          |
| 2  + hello.world  |
| 3  + null         |
+-------------------+

I would like to auto-generate a class that will looks like the following:

class MyTable {
  public static int Foo = 1;
  public static int HelloWorld = 1;
  // null was omitted for Id = 3
}

Answer 1

You could use a T4 transformation to do the work. Use "Add new item" and "Text template".

The T4 language is a way to use C# code to genarate C# code. Most text is parsed directly to the output file, and new code can be written inside <# and #> tags. The file starts with wrapped imports and using statements, so a very simple template could be something like:

   <#@ template debug="false" hostspecific="false" language="C#" #>
   <#@ import namespace="System.Data" #>
   <#@ import namespace="System.Data.SqlClient" #>
   <#@ assembly name="System.Data" #>

   namespace Some.Namespace
   {
       public class TestClass 
       {
    <# 

    using(var cnn = new SqlConnection(@"server=.\sqlexpress;Integrated Security=SSPI;Database=ApplicationManagement"))
    {
        cnn.Open();
        var cmd = new SqlCommand("SELECT TextKey, TextValue FROM TblBrandingKeyValues WHERE BrandingIdentifier = 'Default'", cnn);

        var reader = cmd.ExecuteReader();

        while (reader.Read())
        {
            var defaultText = reader.GetString(1);
            var name = reader.GetString(0);


    #>
    public string <#= name #> 
    {
        get { return "<#= defaultText #>"; } 
    }

    <#
        }
    }

     #>

    }
}

} <#@ output extension=".cs" #>

This template would create a class TestClass with a set of read only properties retrieved from database table TblBrandingKeyValues .

I would recommend these T4 tutorials .

Answer 2

if you want to create your own custom tool you better look at the System.CodeDom Namespace which contains all you need for generating code. Of course you have to code the algorithm that generate the class.

more info at the below link:

http://msdn.microsoft.com/en-us/library/ms404245.aspx

Bear in mind anyway that .NET already offers lots of "build-in" tool/namespace that does exactly the same job (for example using Entity Framework)

Answer 3

Use T4 Templates . I generate lots of classes that way.