無法寫入處於目前狀態的位置參數。寫入器無法以屬性形式寫入位置參數，因為寫入器已開始寫入項目，而且寫入器也無法展開此位置參數，因為包含此位置參數的標記延伸上沒有預設建構函式。請嘗試將先前節點資料流中的位置參數成員，移到 XamlXmlWriter 仍然可以寫入屬性的地方。

Cannot write positional parameters in the current state. The writer cannot write the positional parameters in attribute form because the writer has started to write elements, nor can the writer expand the positional parameters due to the lack of a default constructor on the markup extension that contains the positional parameters. Try moving the positional parameter member earlier in the node stream, to a place where XamlXmlWriter can still write attributes.

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