CodeDom六--实体类生成示例

      CodeDom这个东西个人觉得知识点不多，前几个续节写的已差不多了。在这节将演示一个CodeDom示例：

数据库实体类的生成。这里先声明在如今的CodeSmith或者是T4模板中实现这些都很简单，并且更实用，在这

里只是一个CodeDom示例，为了演示CodeDom。

      在代码中位了简单、简化数据库数据信息的提取，引用了CodeSimth的SchemaExplorer.dll和SchemaExplorer.

SqlSchemaProvider.dll。可以在Demo中的CodeSimth目录下找到。

      先贴上代码，需要讲解的东西没有什么：

using System;

using System.Text;

using System.Windows.Forms;

using SchemaExplorer;

using System.CodeDom;

using System.CodeDom.Compiler;

namespace CodeDomDemo

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

private void Form1_Load(object sender, EventArgs e)

{

IDbSchemaProvider provider = new SqlSchemaProvider();

string connectionString = System.Configuration.ConfigurationManager.

AppSettings["ConnectionString"].ToString();

if (string.IsNullOrEmpty(connectionString))

{

MessageBox.Show(this, "Connection String is requested,in app configuration.",

 "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);

Application.Exit();

}

DatabaseSchema db = new DatabaseSchema(provider, connectionString);

lboxTables.Items.AddRange(db.Tables.ToArray());

}

        public CodeCompileUnit GenTableCompilerUnit(TableSchema item)

{

if (item == null)

throw new ArgumentNullException("item");

CodeTypeDeclaration tableClass = new CodeTypeDeclaration();

tableClass.Attributes = MemberAttributes.Public | MemberAttributes.Final;

tableClass.Name = item.Name;

            foreach (var col in item.Columns)

{

CodeMemberField field = new CodeMemberField(

new CodeTypeReference(col.SystemType), "_" + col.Name);

CodeMemberProperty property = new CodeMemberProperty();

property.Name = col.Name;

property.Attributes = MemberAttributes.Public | MemberAttributes.Final;

property.Type = new CodeTypeReference(col.SystemType);

property.SetStatements.Add(new CodeAssignStatement(

new CodeFieldReferenceExpression(new CodeThisReferenceExpression(),

field.Name), new CodePropertySetValueReferenceExpression()));

property.GetStatements.Add(new CodeMethodReturnStatement(

new CodeFieldReferenceExpression(new CodeThisReferenceExpression(), field.Name)));

tableClass.Members.Add(field);

tableClass.Members.Add(property);

}

CodeNamespace nspace = new CodeNamespace(item.Database.Name);

nspace.Imports.Add(new CodeNamespaceImport("System"));

nspace.Types.Add(tableClass);

CodeCompileUnit unit=new CodeCompileUnit();

unit.Namespaces.Add(nspace);

return unit;

}

public string GenTanleCodeFromCompilerUnit(CodeCompileUnit unit, string language)

{

CodeGeneratorOptions option=new CodeGeneratorOptions();

option.BlankLinesBetweenMembers =true;

option.BracingStyle ="c";

option.ElseOnClosing=true;

option.IndentString="    ";

StringBuilder sb=new StringBuilder();

System.IO.StringWriter sw=new System.IO.StringWriter(sb);

CodeDomProvider.CreateProvider(language).GenerateCodeFromCompileUnit(unit, sw, option);

sw.Close();

return sb.ToString();

}

        private void lboxTables_SelectedIndexChanged(object sender, EventArgs e)

{

int index = lboxTables.SelectedIndex;

if (index > -1 && index < lboxTables.Items.Count)

{

object obj = lboxTables.Items[index];

if (obj is TableSchema)

{

CodeCompileUnit unit= GenTableCompilerUnit(obj as TableSchema);

string language="c#";

if(!string.IsNullOrEmpty(this.toolStripComboBox1.Text))

language=this.toolStripComboBox1.Text;

string code = GenTanleCodeFromCompilerUnit(unit,language);

this.rtbCode.Text = code;

}

}

}

}

}

运行示图:c#图

vb图：

               代码比较简单界面也做得太简洁了，呵呵导出文件都没有，我觉得没有什么必要讲解的，如果有什么不懂的或者是写的不对

       不好的，请留言，我会尽快回复。

CodeDom代码下载；