将Linq结果分配给Datatable

Question

我从linq查询中得到的结果是var(IEnumrable<'T'> anonymous type<'string,int>')

我希望结果在数据表或数据集中。

Answer 1

我为该问题找到了两个样本；

样品I:

我创建了一个名为LINQToDataTable的公共方法，如下所示：

public DataTable LINQToDataTable<T>(IEnumerable<T> varlist)
{
     DataTable dtReturn = new DataTable();
     // column names 
     PropertyInfo[] oProps = null;
     if (varlist == null) return dtReturn;
     foreach (T rec in varlist)
     {
          // Use reflection to get property names, to create table, Only first time, others 
          will follow 
          if (oProps == null)
          {
               oProps = ((Type)rec.GetType()).GetProperties();
               foreach (PropertyInfo pi in oProps)
               {
                    Type colType = pi.PropertyType;
                    if ((colType.IsGenericType) && (colType.GetGenericTypeDefinition()      
                    ==typeof(Nullable<>)))
                     {
                         colType = colType.GetGenericArguments()[0];
                     }
                    dtReturn.Columns.Add(new DataColumn(pi.Name, colType));
               }
          }
          DataRow dr = dtReturn.NewRow();
          foreach (PropertyInfo pi in oProps)
          {
               dr[pi.Name] = pi.GetValue(rec, null) == null ?DBNull.Value :pi.GetValue
               (rec,null);
          }
          dtReturn.Rows.Add(dr);
     }
     return dtReturn;
}

样本II

这是我的第二种方法：

public DataTable ToDataTable(System.Data.Linq.DataContext ctx, object query)
{
     if (query == null)
     {
          throw new ArgumentNullException("query");
     }
     IDbCommand cmd = ctx.GetCommand(query as IQueryable);
     SqlDataAdapter adapter = new SqlDataAdapter();
     adapter.SelectCommand = (SqlCommand)cmd;
     DataTable dt = new DataTable("sd");
     try
     {
          cmd.Connection.Open();
          adapter.FillSchema(dt, SchemaType.Source); 
          adapter.Fill(dt);
     }
     finally
     {
          cmd.Connection.Close();
     }
     return dt;
}