打断点无效
断点显示白色，鼠标移上去，提示：The breakpoint will not currently be hit. No Symbols have been loaded for this document. 如下图：
解决方法
Debug > Options > General > 将 “Enable Just My Code”前的复选框取消掉
断点显示白色，鼠标移上去，提示：The breakpoint will not currently be hit. No Symbols have been loaded for this document. 如下图：
Debug > Options > General > 将 “Enable Just My Code”前的复选框取消掉