vb.net中的CType [英] CType in vb.net

问题描述

SELECT op_need_name 
FROM ces_v_skill_operation_name 
WHERE oper_need_code in (SELECT DISTINCT oper_need_code FROM ces_skill_style_master WHERE fg_mat_no = '" + (ValueDescriptionPair)ddstyle.SelectedItem.Value + "')AND critical_code ='B'

当我编译代码时，出现了这样的错误

When i compile the code i got the error like this

Error   1   Cannot convert type 'string' to 'ValueDescriptionPair' 

请帮助某人

在此先感谢

Pls help somebody

Thanks in advance

推荐答案

您正在尝试将内部类型转换为复杂类型.你不能那样做.

更改此内容:

You''re trying to convert an intrinsic type to a complex type. You can''t do that.

Change this:

(ValueDescriptionPair)ddstyle.SelectedItem.Value

对此:

to this:

ddstyle.SelectedItem.Value.ToString()

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