silverlight datagrid动态生成列&动态绑定

概述由于返回的数据表的列不是固定的，所以webservice端的实体我们直接建立如下格式：     public class DynamicObj    {        public string Item_Name { get; set; }           //列名称        public List<string> Item_Value { get; set; }    //列值

由于返回的数据表的列不是固定的，所以webservice端的实体我们直接建立如下格式：

    public class DynamicObj    {        public string Item_name { get; set; }           //列名称        public List<string> Item_Value { get; set; }    //列值集合    }

然后webservice端返回该对象的集合，也就是列的集合。silverlight做如下处理，就可以动态生成绑定了：

        private voID clIEnt_Get_DynamicObjCompleted(object sender,Get_DynamicObjCompletedEventArgs e)        {            DynamicObj[] result = e.Result;            List<Dictionary<string,string>> dataSources = new List<Dictionary<string,string>>(result[0].Item_Value.Length);            for (int j = 0; j < result[0].Item_Value.Length; j++)            {                Dictionary<string,string> item = new Dictionary<string,string>();//数据行（Key:列名，Value：列值）                for (int i = 0; i < result.Length; i++)                {                    //列名必须符合变量命名规则                    item.Add(result[i].Item_name.Replace(" ","_").Replace("-","_"),result[i].Item_Value[j]);                }                dataSources.Add(item);            }            dataGrID1.ItemsSource = GetEnumerable(dataSources).ToDataSource();        }

GetEnumerable：

        public IEnumerable<IDictionary> GetEnumerable(List<Dictionary<string,string>> SourceList)        {            for (int i = 0; i < SourceList.Count; i++)            {                var dict = new Dictionary<string,string>();                dict = SourceList[i];                yIEld return dict;            }        }

ToDataSource为IEnumerable<IDictionary>的扩展方法，代码如下：

    public static class DataSourceCreator    {        private static Readonly Regex PropertnameRegex =               new Regex(@"^[A-Za-z]+[A-Za-z1-9_]*{1}quot;,RegexOptions.Singleline);        public static List<object> ToDataSource(this IEnumerable<IDictionary> List)        {            IDictionary firstDict = null;            bool hasData = false;            foreach (IDictionary currentDict in List)            {                hasData = true;                firstDict = currentDict;                break;            }            if (!hasData)            {                return new List<object> { };            }            if (firstDict == null)            {                throw new ArgumentException("IDictionary entry cannot be null");            }            Type objectType = null;            TypeBuilder tb = GetTypeBuilder(List.GetHashCode());            ConstructorBuilder constructor =                        tb.defineDefaultConstructor(                                    MethodAttributes.Public |                                    MethodAttributes.Specialname |                                    MethodAttributes.RTSpecialname);            foreach (DictionaryEntry pair in firstDict)            {                if (PropertnameRegex.IsMatch(Convert.ToString(pair.Key),0))                {                    CreateProperty(tb,Convert.ToString(pair.Key),pair.Value == null ?                                                typeof(object) :                                                pair.Value.GetType());                }                else                {                    throw new ArgumentException(                                @"Each key of IDictionary must be                                Alphanumeric and start with character.");                }            }            objectType = tb.CreateType();            return GenerateArray(objectType,List,firstDict);        }        private static List<object> GenerateArray(Type objectType,IEnumerable<IDictionary> List,IDictionary firstDict)        {            var itemsSource = new List<object>();            foreach (var currentDict in List)            {                if (currentDict == null)                {                    throw new ArgumentException("IDictionary entry cannot be null");                }                object row = Activator.CreateInstance(objectType);                foreach (DictionaryEntry pair in firstDict)                {                    if (currentDict.Contains(pair.Key))                    {                        PropertyInfo property =                            objectType.GetProperty(Convert.ToString(pair.Key));                        property.SetValue(                            row,Convert.ChangeType(                                    currentDict[pair.Key],property.PropertyType,null),null);                    }                }                itemsSource.Add(row);            }            return itemsSource;        }        private static TypeBuilder GetTypeBuilder(int code)        {            Assemblyname an = new Assemblyname("TempAssembly" + code);            AssemblyBuilder assemblyBuilder =                AppDomain.CurrentDomain.defineDynamicAssembly(                    an,AssemblyBuilderAccess.Run);            ModuleBuilder moduleBuilder = assemblyBuilder.defineDynamicModule("MainModule");            TypeBuilder tb = moduleBuilder.defineType("TempType" + code,TypeAttributes.Public |                                TypeAttributes.Class |                                TypeAttributes.autoClass |                                TypeAttributes.AnsiClass |                                TypeAttributes.BeforeFIEldInit |                                TypeAttributes.autoLayout,typeof(object));            return tb;        }        private static voID CreateProperty(TypeBuilder tb,string propertyname,Type propertyType)        {            FIEldBuilder fIEldBuilder = tb.defineFIEld("_" + propertyname,propertyType,FIEldAttributes.Private);            PropertyBuilder propertyBuilder =                tb.defineProperty(                    propertyname,PropertyAttributes.HasDefault,null);            MethodBuilder getPropMthdBldr =                tb.defineMethod("get_" + propertyname,MethodAttributes.Public |                    MethodAttributes.Specialname |                    MethodAttributes.HIDeBySig,Type.EmptyTypes);            ILGenerator getIL = getPropMthdBldr.GetILGenerator();            getIL.Emit(OpCodes.Ldarg_0);            getIL.Emit(OpCodes.Ldfld,fIEldBuilder);            getIL.Emit(OpCodes.Ret);            MethodBuilder setPropMthdBldr =                tb.defineMethod("set_" + propertyname,MethodAttributes.Public |                  MethodAttributes.Specialname |                  MethodAttributes.HIDeBySig,null,new Type[] { propertyType });            ILGenerator setIL = setPropMthdBldr.GetILGenerator();            setIL.Emit(OpCodes.Ldarg_0);            setIL.Emit(OpCodes.Ldarg_1);            setIL.Emit(OpCodes.Stfld,fIEldBuilder);            setIL.Emit(OpCodes.Ret);            propertyBuilder.Setgetmethod(getPropMthdBldr);            propertyBuilder.SetSetMethod(setPropMthdBldr);        }    }

总结

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