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当我尝试打开一个没有任何参数的表单时,抛出“指定的强制转换无效”异常。表单加载成功,但是当我调用 form.showdialog 时,它抛出了异常。我不知道,我能做什么?只有当我从program.cs调用它时我才能显示表格谢谢