如何从以 C# UNity 编写的 JSON 格式的文件中删除特殊字符或不需要的符号？

Question

我写后读时的JSON格式如下

 � [{"SaveValues":[{"id":1,"allposition":{"x":-5.12429666519165,"y":4.792403697967529},"allrotation":{"x":0.0,"y":0.0,"z":0.0,"w":1.0},"allscale":{"x":1.0,"y":1.0},"linepos0":{"x":0.0,"y":0.0,"z":0.0},"linepos1":{"x":0.0,"y":0.0,"z":0.0},"movetype":1},{"id":1,"allposition":{"x":-4.788785934448242,"y":-3.4373996257781984},"allrotation":{"x":0.0,"y":0.0,"z":0.0,"w":1.0},"allscale":{"x":1.0,"y":1.0},"linepos0":{"x":0.0,"y":0.0,"z":0.0},"linepos1":{"x":0.0,"y":0.0,"z":0.0},"movetype":1}],"NoteValues":[{"movenumber":1,"notemsg":"Move One"}]},{"SaveValues":[{"id":1,"allposition":{"x":-5.12429666519165,"y":4.792403697967529},"allrotation":{"x":0.0,"y":0.0,"z":0.0,"w":1.0},"allscale":{"x":1.0,"y":1.0},"linepos0":{"x":0.0,"y":0.0,"z":0.0},"linepos1":{"x":0.0,"y":0.0,"z":0.0},"movetype":2},{"id":1,"allposition":{"x":-4.788785934448242,"y":-3.4373996257781984},"allrotation":{"x":0.0,"y":0.0,"z":0.0,"w":1.0},"allscale":{"x":1.0,"y":1.0},"linepos0":{"x":0.0,"y":0.0,"z":0.0},"linepos1":{"x":0.0,"y":0.0,"z":0.0},"movetype":2},{"id":2,"allposition":{"x":5.185188293457031,"y":4.803859233856201},"allrotation":{"x":0.0,"y":0.0,"z":0.0,"w":1.0},"allscale":{"x":1.0,"y":1.0},"linepos0":{"x":0.0,"y":0.0,"z":0.0},"linepos1":{"x":0.0,"y":0.0,"z":0.0},"movetype":2},{"id":2,"allposition":{"x":5.154441833496094,"y":-4.023111343383789},"allrotation":{"x":0.0,"y":0.0,"z":0.0,"w":1.0},"allscale":{"x":1.0,"y":1.0},"linepos0":{"x":0.0,"y":0.0,"z":0.0},"linepos1":{"x":0.0,"y":0.0,"z":0.0},"movetype":2}],"NoteValues":[{"movenumber":2,"notemsg":"Move Two"}]}]

我用于保存为 JSON 格式的代码如下所示。

 ListContainer container = new ListContainer(getAlldata,playerNotes);

    var temp = container;
    //--Adding data in container into List<string> jsonstring
    jsonstring.Add(JsonUtility.ToJson(temp));

 //--Combing list of string into a single string
    string jsons = "[" +string.Join(",", jsonstring)+"]";

    //Writing into a JSON file in the persistent path
    using (FileStream fs = new FileStream( Path.Combine(Application.persistentDataPath , savedName+".json"), FileMode.Create))
    {
        BinaryWriter filewriter = new BinaryWriter(fs);

        filewriter.Write(jsons);
        fs.Close();

    }

在这里，我希望删除出现在 JSON 格式起点的特殊字符。 我正在尝试使用以下代码读取 JSON

 using (FileStream fs = new FileStream(Application.persistentDataPath + "/" + filename, FileMode.Open))
        {


            fs.Dispose();
            string dataAsJson = File.ReadAllText(Path.Combine(Application.persistentDataPath, filename));
            Debug.Log("DataJsonRead - - -" + dataAsJson);

        }

我收到一个错误 - ArgumentException: JSON 解析错误：无效值。 如何从一开始就删除那个特殊或不需要的符号？我认为这与将文件写入目录有关。在尝试使用其他方法保存时，我没有找到任何字符或符号。

Answer 1

� 是 Unicode 替换字符，当尝试读取文本时发出，就好像它们是使用错误的代码页使用单字节代码页进行编码一样。 它不是 BOM - File.ReadAllText会识别它并使用它使用正确的编码加载文件的 rest。 这意味着一开始就有垃圾。

该问题是由BinaryWriter使用不当引起的。 class 用于将原始类型的字段以二进制格式写入 stream。 对于像字符串这样的可变长度类型，第一个字节包含字段长度。

这段代码：

using var ms=new MemoryStream();
using( BinaryWriter writer = new BinaryWriter(ms))
{  
  writer.Write(new String('0',3));        
}

var b=ms.ToArray();

生产

3, 48,48,48

请改用StreamWriter或File.WriteAllText 。 使用的默认编码是 UTF8，因此无需指定编码或尝试更改任何内容：

using (FileStream fs = new FileStream( Path.Combine(Application.persistentDataPath , savedName+".json"), FileMode.Create))
using(var writer=new StreamWriter(fs))
{
        writer.Write(jsons);
}

或者

var path=Path.Combine(Application.persistentDataPath , savedName+".json")
using(var writer=new StreamWriter(path))
{
        writer.Write(jsons);
}

Answer 2

首先将其添加到 your.cs 文件

using System.Text.RegularExpressions;

那么我们可以使用RegEx执行此操作，如下所示。

varName = Regex.Replace(SaveValues, "[-*]", "");

这将查找-符号并将其从字符串中删除。
希望这可以帮助。