（转）DATATABLE(DATASET)与实体类之间的互转.

转自：http://www.cnblogs.com/zzyyll2/archive/2010/07/20/1781649.html

dataset和实体类 之间的转换

//dataset转实体类 

public static IList<T> FillModel(DataSet ds) 
{ 
List<T> l = new List<T>(); 
T model = default(T);

if (ds.Tables[0].Columns[0].ColumnName == "rowId") 
{ 
ds.Tables[0].Columns.Remove("rowId"); 
}

 

foreach (DataRow dr in ds.Tables[0].Rows) 
{


model = Activator.CreateInstance<T>();

foreach (DataColumn dc in dr.Table.Columns) 
{

PropertyInfo pi = model.GetType().GetProperty(dc.ColumnName); 
if (dr[dc.ColumnName] != DBNull.Value) 
pi.SetValue(model, dr[dc.ColumnName], null); 
else 
pi.SetValue(model, null, null);

} 
l.Add(model); 
}

return l;


}

将实体类转换成DataTable

/// <summary> 
/// 将实体类转换成DataTable 
/// </summary> 
/// <typeparam name="T"></typeparam> 
/// <param name="i_objlist"></param> 
/// <returns></returns> 
public static DataTable Fill<T>(IList<T> objlist) 
{ 
if (objlist == null || objlist.Count <= 0) 
{ 
return null; 
} 
DataTable dt = new DataTable(typeof(T).Name); 
DataColumn column; 
DataRow row;

System.Reflection.PropertyInfo[] myPropertyInfo = typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance);

foreach (T t in objlist) 
{ 
if (t == null) 
{ 
continue; 
}

row = dt.NewRow();

for (int i = 0, j = myPropertyInfo.Length; i < j; i++) 
{ 
System.Reflection.PropertyInfo pi = myPropertyInfo[i];

string name = pi.Name;

if (dt.Columns[name] == null) 
{ 
column = new DataColumn(name, pi.PropertyType); 
dt.Columns.Add(column); 
}

row[name] = pi.GetValue(t, null); 
}

dt.Rows.Add(row); 
} 
return dt; 
}