无法在“<var>X</var>”类型上调用 AddNew。此类型没有公共默认构造函数。如果设置 AllowNew=true 并处理 AddingNew 事件，则可以在“<var>X</var>”类型上调用 AddNew。

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AddNew cannot be called on the '<var>X</var>' type. This type does not have a public default constructor. You can call AddNew on the '<var>X</var>' type if you set AllowNew=true and handle the AddingNew event.

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