转自：http://www.cnblogs.com/dyfzwj/archive/2011/04/16/2017916.html
/// <summary>
/// DataTable与实体类互相转换 /// </summary> /// <typeparam name="T">实体类</typeparam> public class ModelHandler<T> where T : new() { #region DataTable转换成实体类/// <summary>
/// 填充对象列表：用DataSet的第一个表填充实体类 /// </summary> /// <param name="ds">DataSet</param> /// <returns></returns> public List<T> FillModel(DataSet ds) { if (ds == null || ds.Tables[0] == null || ds.Tables[0].Rows.Count == 0) { return null; } else { return FillModel(ds.Tables[0]); } }/// <summary>
/// 填充对象列表：用DataSet的第index个表填充实体类 /// </summary> public List<T> FillModel(DataSet ds, int index) { if (ds == null || ds.Tables.Count <= index || ds.Tables[index].Rows.Count == 0) { return null; } else { return FillModel(ds.Tables[index]); } }/// <summary>
/// 填充对象列表：用DataTable填充实体类 /// </summary> public List<T> FillModel(DataTable dt) { if (dt == null || dt.Rows.Count == 0) { return null; } List<T> modelList = new List<T>(); foreach (DataRow dr in dt.Rows) { //T model = (T)Activator.CreateInstance(typeof(T)); T model = new T(); for (int i = 0; i < dr.Table.Columns.Count; i++) { PropertyInfo propertyInfo = model.GetType().GetProperty(dr.Table.Columns[i].ColumnName); if (propertyInfo != null && dr[i] != DBNull.Value) propertyInfo.SetValue(model, dr[i], null); } modelList.Add(model); } return modelList; }/// <summary>
/// 填充对象：用DataRow填充实体类 /// </summary> public T FillModel(DataRow dr) { if (dr == null) { return default(T); }//T model = (T)Activator.CreateInstance(typeof(T));
T model = new T();for (int i = 0; i < dr.Table.Columns.Count; i++)
{ PropertyInfo propertyInfo = model.GetType().GetProperty(dr.Table.Columns[i].ColumnName); if (propertyInfo != null && dr[i] != DBNull.Value) propertyInfo.SetValue(model,dr[i],null); } return model; }#endregion
#region 实体类转换成DataTable
/// <summary>
/// 实体类转换成DataSet /// </summary> /// <param name="modelList">实体类列表</param> /// <returns></returns> public DataSet FillDataSet(List<T> modelList) { if (modelList == null || modelList.Count == 0) { return null; } else { DataSet ds = new DataSet(); ds.Tables.Add(FillDataTable(modelList)); return ds; } }/// <summary>
/// 实体类转换成DataTable /// </summary> /// <param name="modelList">实体类列表</param> /// <returns></returns> public DataTable FillDataTable(List<T> modelList) { if (modelList == null || modelList.Count == 0) { return null; } DataTable dt = CreateData(modelList[0]);foreach(T model in modelList)
{ DataRow dataRow = dt.NewRow(); foreach (PropertyInfo propertyInfo in typeof(T).GetProperties()) { dataRow[propertyInfo.Name] = propertyInfo.GetValue(model, null); } dt.Rows.Add(dataRow); } return dt; }/// <summary>
/// 根据实体类得到表结构 /// </summary> /// <param name="model">实体类</param> /// <returns></returns> private DataTable CreateData(T model) { DataTable dataTable = new DataTable(typeof (T).Name); foreach (PropertyInfo propertyInfo in typeof(T).GetProperties()) { dataTable.Columns.Add(new DataColumn(propertyInfo.Name, propertyInfo.PropertyType)); } return dataTable; }#endregion
}