反射List<M> To DataTable|反射IList To DataTable|反射 DataTable To List<M>
将DataTable集合反射获取 List<M>
/// <summary> /// 根据DataTable集合反射获取 List<M> /// </summary> /// <typeparam name="M">泛型实体</typeparam> /// <param name="dt">DataTable</param> /// <returns>实体集合</returns> private static List<M> SetValueRow<M>(DataTable dt) where M : new() { List<M> list = new List<M>(); Type type; PropertyInfo p; M m; foreach (DataRow row in dt.Rows) { m = new M(); type = m.GetType(); foreach (DataColumn col in dt.Columns) { //获取一个字段的属性 p = type.GetProperty(col.ColumnName); //实体中无对应属性 if (p == null) continue; string colDbType = row[col.ColumnName].GetType().FullName; //结果集单元格中的值不为空时才赋值 if (colDbType != "System.DBNull") { switch (p.PropertyType.FullName) { case "System.Int64"://根据不同数据库数据类型作转换，如oracle的number(2)应转换为Int32，而不是默认的Decemal p.SetValue(m, Convert.ToInt64(row[col.ColumnName]), null); break; case "System.Int32": p.SetValue(m, Convert.ToInt32(row[col.ColumnName]), null); break; case "System.Int16": p.SetValue(m, Convert.ToInt16(row[col.ColumnName]), null); break; case "System.String": p.SetValue(m, Convert.ToString(row[col.ColumnName]), null); break; case "System.Decimal": p.SetValue(m, Convert.ToDecimal(row[col.ColumnName]), null); break; case "System.DateTime": p.SetValue(m, row[col.ColumnName], null); break; case "System.Double": p.SetValue(m, Convert.ToDouble(row[col.ColumnName]), null); break; case "System.Boolean": p.SetValue(m, Convert.ToBoolean(row[col.ColumnName]), null); break; case "System.Byte": p.SetValue(m, Convert.ToByte(row[col.ColumnName]), null); break; default: p.SetValue(m, row[col.ColumnName], null); break; } } } list.Add(m); } return list; }
将IList集合类转换成DataTable
/// <summary> /// 将IList集合类转换成DataTable /// </summary> /// <param name="list">集合</param> /// <returns></returns> public static DataTable IListToDataTable(IList list) { DataTable result = new DataTable(); if (list.Count > 0) { PropertyInfo[] propertys = list[0].GetType().GetProperties(); foreach (PropertyInfo pi in propertys) { result.Columns.Add(pi.Name, pi.PropertyType); } for (int i = 0; i < list.Count; i++) { ArrayList tempList = new ArrayList(); foreach (PropertyInfo pi in propertys) { object obj = pi.GetValue(list[i], null); tempList.Add(obj); } object[] array = tempList.ToArray(); result.LoadDataRow(array, true); } } return result; }
将List<M>集合类转换成DataTable
/// <summary> /// 将List<M>集合类转换成DataTable /// </summary> /// <param name="list">集合</param> /// <returns></returns> public static DataTable IListToDataTable<M>(List<M> list) { DataTable result = new DataTable(); if (list.Count > 0) { PropertyInfo[] propertys = list[0].GetType().GetProperties(); foreach (PropertyInfo pi in propertys) { result.Columns.Add(pi.Name, pi.PropertyType); } for (int i = 0; i < list.Count; i++) { ArrayList tempList = new ArrayList(); foreach (PropertyInfo pi in propertys) { object obj = pi.GetValue(list[i], null); tempList.Add(obj); } object[] array = tempList.ToArray(); result.LoadDataRow(array, true); } } return result; }
全局静态类 泛型方法
/// <summary> /// 全局静态类 /// </summary> public static class GlobalStaticClass : Object { public static List<M> ToModelList<M>(this object obj) where M : new() { List<M> list = new List<M>(); Type type; PropertyInfo p; M m; DataTable dt = (DataTable)obj; foreach (DataRow row in dt.Rows) { m = new M(); type = m.GetType(); foreach (DataColumn col in dt.Columns) { //获取一个字段的属性 p = type.GetProperty(col.ColumnName); //实体中无对应属性 if (p == null) continue; string colDbType = row[col.ColumnName].GetType().FullName; //结果集单元格中的值不为空时才赋值 if (colDbType != "System.DBNull") { switch (p.PropertyType.FullName) { case "System.Int64"://根据不同数据库数据类型作转换，如oracle的number(2)应转换为Int32，而不是默认的Decemal p.SetValue(m, Convert.ToInt64(row[col.ColumnName]), null); break; case "System.Int32": p.SetValue(m, Convert.ToInt32(row[col.ColumnName]), null); break; case "System.Int16": p.SetValue(m, Convert.ToInt16(row[col.ColumnName]), null); break; case "System.String": p.SetValue(m, Convert.ToString(row[col.ColumnName]), null); break; case "System.Decimal": p.SetValue(m, Convert.ToDecimal(row[col.ColumnName]), null); break; case "System.DateTime": p.SetValue(m, row[col.ColumnName], null); break; case "System.Double": p.SetValue(m, Convert.ToDouble(row[col.ColumnName]), null); break; case "System.Boolean": p.SetValue(m, Convert.ToBoolean(row[col.ColumnName]), null); break; case "System.Byte": p.SetValue(m, Convert.ToByte(row[col.ColumnName]), null); break; default: p.SetValue(m, row[col.ColumnName], null); break; } } } list.Add(m); } return list; } }
实体父类，实体继承此类后，实体对象可调用this.SetValue(object) 方法通过反射给自身对象赋值
public class ModelBase { protected bool isNull = true; public bool IsNull { get { return isNull; } set { isNull = value; } } protected void SetValue(object info) { foreach (FieldInfo fi in info.GetType().GetFields(BindingFlags.NonPublic | BindingFlags.Instance)) { this.GetType().GetField(fi.Name, BindingFlags.NonPublic | BindingFlags.Instance).SetValue(this, fi.GetValue(info)); } } public void SetValue(SqlDataReader dr) { if (dr.Read()) { foreach (FieldInfo fi in this.GetType().GetFields(BindingFlags.NonPublic | BindingFlags.Instance)) { if (fi.Name != "isNull") { object rel = dr[fi.Name]; if (dr[fi.Name] != Convert.DBNull) { fi.SetValue(this, dr[fi.Name]); } } } this.isNull = false; } dr.Close(); } public void SetValue(DataRow dr) { foreach (FieldInfo fi in this.GetType().GetFields(BindingFlags.NonPublic | BindingFlags.Instance)) { if (fi.Name != "isNull") { if (dr.Table.Columns.Contains(fi.Name)) { object rel = dr[fi.Name]; if (dr[fi.Name] != Convert.DBNull) { fi.SetValue(this, dr[fi.Name]); } } } } this.isNull = false; } }
