将字符串转换为 System.IO.Stream

Question

我创建了一个可序列化的类并添加了一些对象。 现在我希望在单击按钮时创建一个 xml 文件（基于该类），所以我这样做了：

private void Button1_Clicked(object sender, EventArgs e)
        {
            string fileName = "Data.xml";
            MySerializableClass msc = new MySerializableClass();
            XmlSerializer serializer = new XmlSerializer(typeof(MySerializableClass));
            StreamWriter sw = new StreamWriter(fileName, Encoding.UTF8); //'filename' is underlined
            serializer.Serialize(sw, msc);
            sw.Close(); //'Close' is underlined
            //'StreamWriter' does not contain a definition for 'Close' [...]
        }

不幸的是，我收到以下错误：cannot convert from 'String' to em> 'System.IO.Stream'。这是什么意思？我不明白为什么编码为 UTF8 不起作用。不使用编码会给我同样的错误。

Answer 1

streamwriter 构造函数参数错误..

        string fileName = "your file path";
        using(FileStream fileStream = new FileStream(fileName, FileMode.OpenOrCreate))
        {
            using (StreamWriter sw = new StreamWriter(fileStream, Encoding.UTF8))
            {
                MySerializableClass msc = new MySerializableClass();
                XmlSerializer serializer = new XmlSerializer(typeof(MySerializableClass));
                serializer.Serialize(sw, msc);
            }
        }

如果你想不使用 FileStream，使用这个构造函数.. StreamWriter(string path, bool append, Encoding encoding)

        string fileName = "your file path";
        using (StreamWriter sw = new StreamWriter(fileName, true, Encoding.UTF8))
        {
            MySerializableClass msc = new MySerializableClass();
            XmlSerializer serializer = new XmlSerializer(typeof(MySerializableClass));
            serializer.Serialize(sw, msc);
        }

Answer 2

请参阅StreamWriter 的文档。 https://msdn.microsoft.com/en-us/library/system.io.streamwriter(v=vs.110).aspx

试试这个重载StreamWriter sw = new StreamWriter(fileName, false, Encoding.UTF8);

或者你需要从“data.xml”文件创建一个流，而不是仅仅传递文件名。