在程序中动态生成实体类

public class DataColumnInfo
    {
        public string ColumnName { get; set; }
        public System.Type DataType { get; set; }
    } 
 

public class DynamicDataBuilder
    {

     public static DynamicDataBuilder Instance = new DynamicDataBuilder(); // Make it singleton class, so easier to use

     private ModuleBuilder moduleBuilder; 

    private System.Type BuildDataObjectType(List<DataColumnInfo> Columns, string DataObjectName)
        {            
        
         if (moduleBuilder == null)
            {
                AssemblyBuilder assemblyBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly(new AssemblyName("DynamicData"), AssemblyBuilderAccess.Run);
                moduleBuilder = assemblyBuilder.DefineDynamicModule("DataModule");
            }             
    
            TypeBuilder tb = moduleBuilder.DefineType(DataObjectName,
                                                    TypeAttributes.Public |
                                                    TypeAttributes.Class |
                                                    TypeAttributes.AutoClass |
                                                    TypeAttributes.AnsiClass |
                                                    TypeAttributes.BeforeFieldInit |
                                                    TypeAttributes.AutoLayout,
                                                    typeof(object));

            ConstructorBuilder constructor = tb.DefineDefaultConstructor(MethodAttributes.Public | MethodAttributes.SpecialName | MethodAttributes.RTSpecialName);
            foreach (var info in Columns)
            {
                string propertyName = info.ColumnName.Replace(' ', '_');
                FieldBuilder fb = tb.DefineField("_" + propertyName, info.DataType, FieldAttributes.Private);
                PropertyBuilder pb = tb.DefineProperty(propertyName, PropertyAttributes.HasDefault, info.DataType, null);
                MethodBuilder getMethod = tb.DefineMethod("get_" + propertyName,
                                                            MethodAttributes.Public |
                                                            MethodAttributes.HideBySig |
                                                            MethodAttributes.SpecialName,
                                                            info.DataType,
                                                            Type.EmptyTypes);

                ILGenerator ilgen = getMethod.GetILGenerator();
                ilgen.Emit(OpCodes.Ldarg_0);
                ilgen.Emit(OpCodes.Ldfld, fb);
                ilgen.Emit(OpCodes.Ret);
                pb.SetGetMethod(getMethod);
                MethodBuilder setMethod = tb.DefineMethod("set_" + propertyName,
                                                            MethodAttributes.Public |
                                                            MethodAttributes.HideBySig |
                                                            MethodAttributes.SpecialName,
                                                            null,
                                                            new Type[] { info.DataType });
                ilgen = setMethod.GetILGenerator();
                ilgen.Emit(OpCodes.Ldarg_0);
                ilgen.Emit(OpCodes.Ldarg_1);
                ilgen.Emit(OpCodes.Stfld, fb);
                ilgen.Emit(OpCodes.Ret);
                pb.SetSetMethod(setMethod);
            }
            System.Type t = tb.CreateType();
            return t;
        }

        

        public List<object> GetDataList(string XML)
        {

           // Read XML, build ColumnInfo List or convert it  to your DataTable Object

            List<DataColumnInfo> Columns = new List<DataColumnInfo>();

           // Here are just some testing code so you can see how it works
            Columns.Add(new DataColumnInfo { ColumnName = "Title", DataType = typeof(string) });
            Columns.Add(new DataColumnInfo { ColumnName = "Descrption", DataType = typeof(string) });
            Columns.Add(new DataColumnInfo { ColumnName = "StartDate", DataType = typeof(DateTime) });
            Columns.Add(new DataColumnInfo { ColumnName = "EndDate", DataType = typeof(DateTime) });

            System.Type dataType = BuildDataObjectType(Columns, "Data");   // Build the Dynamic Data Type

            List<object> list = new List<object>();
            for (int i = 0; i < 10; i++)   
            {
                object Data = Activator.CreateInstance(dataType);

                if (Data != null)
                {
                    PropertyInfo pi = dataType.GetProperty("Title");  // Read your XML to fill each field of the Dynamic Data
                    if (pi != null)
                        pi.SetValue(Data, "TEST" + i, null);
                    pi = dataType.GetProperty("StartDate");
                    if (pi != null)
                        pi.SetValue(Data, System.DateTime.Now, null);
                }
                list.Add(Data);   // add the DataObject to the List
            }
            return list;
        }
    }

 

//Bind XMLData to the DataGrid:
theGrid.ItemsSource =  DynamicDataBuilder.Instance.GetDataList(xmlData);



//

在silverlight的datagrid中绑定

//////////////////////////////////////例子  在windows中

namespace WindowsFormsApplication1

{

    public class DynamicDataBuilder

    {



        public static DynamicDataBuilder Instance = new DynamicDataBuilder(); // Make it singleton class, so easier to use



        private ModuleBuilder moduleBuilder;



        public  System.Type BuildDataObjectType(List<DataColumnInfo> Columns, string DataObjectName)

        {



            if (moduleBuilder == null)

            {

                AssemblyBuilder assemblyBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly(new AssemblyName("DynamicData"), AssemblyBuilderAccess.Run);

                moduleBuilder = assemblyBuilder.DefineDynamicModule("DataModule");

            }



            TypeBuilder tb = moduleBuilder.DefineType(DataObjectName,

                                                    TypeAttributes.Public |

                                                    TypeAttributes.Class |

                                                    TypeAttributes.AutoClass |

                                                    TypeAttributes.AnsiClass |

                                                    TypeAttributes.BeforeFieldInit |

                                                    TypeAttributes.AutoLayout,

                                                    typeof(object));



            ConstructorBuilder constructor = tb.DefineDefaultConstructor(MethodAttributes.Public | MethodAttributes.SpecialName | MethodAttributes.RTSpecialName);

            foreach (var info in Columns)

            {

                string propertyName = info.ColumnName.Replace(' ', '_');

                FieldBuilder fb = tb.DefineField("_" + propertyName, info.DataType, FieldAttributes.Private);

                PropertyBuilder pb = tb.DefineProperty(propertyName, PropertyAttributes.HasDefault, info.DataType, null);

                MethodBuilder getMethod = tb.DefineMethod("get_" + propertyName,

                                                            MethodAttributes.Public |

                                                            MethodAttributes.HideBySig |

                                                            MethodAttributes.SpecialName,

                                                            info.DataType,

                                                            Type.EmptyTypes);



                ILGenerator ilgen = getMethod.GetILGenerator();

                ilgen.Emit(OpCodes.Ldarg_0);

                ilgen.Emit(OpCodes.Ldfld, fb);

                ilgen.Emit(OpCodes.Ret);

                pb.SetGetMethod(getMethod);

                MethodBuilder setMethod = tb.DefineMethod("set_" + propertyName,

                                                            MethodAttributes.Public |

                                                            MethodAttributes.HideBySig |

                                                            MethodAttributes.SpecialName,

                                                            null,

                                                            new Type[] { info.DataType });

                ilgen = setMethod.GetILGenerator();

                ilgen.Emit(OpCodes.Ldarg_0);

                ilgen.Emit(OpCodes.Ldarg_1);

                ilgen.Emit(OpCodes.Stfld, fb);

                ilgen.Emit(OpCodes.Ret);

                pb.SetSetMethod(setMethod);

            }

            System.Type t = tb.CreateType();

            return t;

        }

    }



    public class DataColumnInfo

    {

        public string ColumnName { get; set; }

        public System.Type DataType { get; set; }

    } 

}

////////////////////////////////////////////

namespace WindowsFormsApplication1

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }



        private void button1_Click(object sender, EventArgs e)

        {

            DataTable dt1 = new DataTable();

            DataColumn dc1 = new DataColumn("col1");

            dt1.Columns.Add(dc1);

            DataRow row1 = dt1.NewRow();

            row1["col1"] = "a";

            dt1.Rows.Add(row1);



            DataTable dt2 = new DataTable();

            DataColumn dc2 = new DataColumn("col2");

            dt2.Columns.Add(dc2);

            DataRow row2 = dt2.NewRow();

            row2["col2"] = "b";

            dt2.Rows.Add(row2);



            //dt1.Columns.Add(dc2);

            //dt1.Merge(dt2, false, MissingSchemaAction.Ignore   );

            //DataTable dt3=UniteDataTable(dt1,dt2,"table3");

            //dt1 = UniteDataTable(dt1, dt2, "Tableaa");



            List<DataColumnInfo> Columns = new List<DataColumnInfo>();

            foreach (DataColumn col in dt1.Columns)

            {

                Columns.Add(new DataColumnInfo { ColumnName = col.ColumnName, DataType = typeof(string) });

            }



            DynamicDataBuilder dy = new DynamicDataBuilder();

            System.Type dataType = dy.BuildDataObjectType(Columns, "DyData");



            List<object> list = new List<object>();

            for (int i = 0; i <dt1.Rows.Count; i++)

            {

                object Data = Activator.CreateInstance(dataType);



                if (Data != null)

                {

                    string colName="col1";

                    PropertyInfo pi = dataType.GetProperty(colName);  // Read your XML to fill each field of the Dynamic Data

                    if (pi != null)

                        pi.SetValue(Data, dt1.Rows[i][colName], null);

                    pi = dataType.GetProperty("col2");

                    if (pi != null)

                        pi.SetValue(Data, System.DateTime.Now.ToShortDateString(), null);

                }

                list.Add(Data);   // add the DataObject to the List

            }

            //return list;

            //foreach (DataRow dr in dt1.Rows)

            //{

            //  object o=  ConvertToEntity(dr, typeof("aaa"));

                

                   

            //}

            //List<object[]> list = new List<object[]>();

            //foreach(DataRow dr in dt1.Rows)

            //{

            //object[] obj = new object[dt1.Columns.Count];

            // dr.ItemArray.CopyTo(obj, 0);

            // list.Add(obj);

            //}

            //DataColumn

            //object[] o = new object[dt1.Columns.Count];

            //o[0] = "Col1";

            //o[1] = "col2";

            //object[] o = new object[dt1.Columns.Count];

            //for (int i = 0; i < dt1.Columns.Count; i++)

            //{

            //    o[i] = dt1.Columns[i].ColumnName;

            //}

            //list.Insert(0, o);

        }

}

测试通过

Tuesday, August 04, 2009 15:12:00