Question

c#net 怎么给一个entity类型的list 转换成dataset

Answer 1

  // 扩展List集合
    static class ExternList {
        public static DataSet ToDataSet<TSource>(this IList<TSource> list)
        {
            Type elementType = typeof(TSource);
            DataSet ds = new DataSet();
            DataTable dt = new DataTable();
            ds.Tables.Add(dt);

            foreach (var pi in elementType.GetProperties())
            {
                Type colType = Nullable.GetUnderlyingType(pi.PropertyType) ?? pi.PropertyType;
                dt.Columns.Add(pi.Name, colType);
            }

            foreach (TSource item in list)
            {
                DataRow row = dt.NewRow();
                foreach (var pi in elementType.GetProperties())
                {
                    row[pi.Name] = pi.GetValue(item, null) ?? DBNull.Value;
                }
                dt.Rows.Add(row);
            }

            return ds;
        }
    }
    
    // 调用示例：
    public class YourType{
      public string Name { get; set; }
    }
    IList<YourType> list = new List<YourType>{
              new YourType(){Name="Foo1"},
              new YourType(){Name="Foo2"},
              new YourType(){Name="Foo3"}
    };

    DataSet ds = list.ToDataSet<YourType>();
    DataTable dt = ds != null && ds.Tables.Count > 0 ? ds.Tables[0] : null;