试试这个简单的问题:

var result=myDataTable.AsEnumerable().Where(myRow => myRow.Field<int>("RowNo") == 1);

VB。代码如下所示:

Dim results = From myRow In myDataTable  
Where myRow.Field(Of Int32)("RowNo") = 1 Select myRow

var query = from p in dt.AsEnumerable()
                    where p.Field<string>("code") == this.txtCat.Text
                    select new
                    {
                        name = p.Field<string>("name"),
                        age= p.Field<int>("age")                         
                    };

name和age字段现在是查询对象的一部分，可以像这样访问:

var results = from myRow in myDataTable
where results.Field<Int32>("RowNo") == 1
select results;

您可以尝试这样做，但必须确定每个Column的值类型

List<MyClass> result = myDataTable.AsEnumerable().Select(x=> new MyClass(){
     Property1 = (string)x.Field<string>("ColumnName1"),
     Property2 = (int)x.Field<int>("ColumnName2"),
     Property3 = (bool)x.Field<bool>("ColumnName3"),    
});

//Create DataTable 
DataTable dt= new DataTable();
dt.Columns.AddRange(new DataColumn[]
{
   new DataColumn("ID",typeof(System.Int32)),
   new DataColumn("Name",typeof(System.String))

});

//Fill with data

dt.Rows.Add(new Object[]{1,"Test1"});
dt.Rows.Add(new Object[]{2,"Test2"});

//Now  Query DataTable with linq
//To work with linq it should required our source implement IEnumerable interface.
//But DataTable not Implement IEnumerable interface
//So we call DataTable Extension method  i.e AsEnumerable() this will return EnumerableRowCollection<DataRow>


// Now Query DataTable to find Row whoes ID=1

DataRow drow = dt.AsEnumerable().Where(p=>p.Field<Int32>(0)==1).FirstOrDefault();
 //