| path | 要写入的文件的路径。 |
| append | 当为 true 时，将数据附加到给定文件，而不是覆盖。 |
在要向其写入下载数据的磁盘上创建一个新实例和一个文件。
如果无法创建文件，则抛出 ArgumentException。 如果给出了到不存在目录中的文件的路径，则会创建所有所需的目录。如果文件存在，除非是在附加模式下，否则文件将被覆盖。如果文件不存在，则无论附加标志如何，都会创建该文件。
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