问题
I'm rewriting/converting some VB-Code:
Dim dt As New System.Data.DataTable()
Dim dr As System.Data.DataRow = dt.NewRow()
Dim item = dr.Item("myItem")
C#:
System.Data.DataTable dt = new System.Data.DataTable();
System.Data.DataRow dr = dt.NewRow();
var item = dr.Item["myItem"];
I can't make it run under C#, the problems I have is the third row var item = dr.Item["myItem"];
:
System.Data.DataRow' does not contain a definition for 'Item' and no extension method 'Item' accepting a first argument of type 'System.Data.DataRow' could be found (are you missing a using directive or an assembly reference?)
I referenced System.Data
Version 4 in both projects. What am I missing here? Note: ItemArray exists in both...
回答1:
Try like this:
var item = dr["myItem"];
In C# you can access the indexer property directly. And the DataRow.Item property is defined as indexer.
回答2:
There is actually no "Item" property in C#. In VB the DataRow cell access is defined like this:
Default Public Property Item (
column As DataColumn
) As Object
So there is a literal "Item" property. However, in C# it is defined like this:
public object this[
DataColumn column
] { get; set; }
So this is the default property of the class / object. So you access it with the object name.
来源:https://stackoverflow.com/questions/7873972/in-c-why-no-item-on-system-data-datarow