格式化JSON字符串

```java

//第一种方式
private void btnFormat1_Click(object sender, EventArgs e)
  {
      if (textBox1.Text.Length == 0)
      {
          return;
      }

try
      {
          JsonSerializer serializer = new JsonSerializer();
          TextReader tr = new StringReader(textBox1.Text);
          JsonTextReader jtr = new JsonTextReader(tr);
          object obj = serializer.Deserialize(jtr);
          if (obj != null)
          {
              StringWriter textWriter = new StringWriter();
              JsonTextWriter jsonWriter = new JsonTextWriter(textWriter)
              {
                  Formatting = Formatting.Indented,
                  Indentation = 4,//缩进字符数
                  IndentChar = ' '//缩进字符
              };
              serializer.Serialize(jsonWriter, obj);
              textBox1.Text = textWriter.ToString();
          }

}
      catch (Exception ex)
      {
          MessageBox.Show("错误的JSON");

}
  }

//第二种方式
  private void btnFormat2_Click(object sender, EventArgs e)
  {
      if (textBox1.Text.Length == 0)
      {
          return;
      }
      try
      {
          //JObject.ToString()方法会内部调用格式化，所以直接使用即可
          string json = textBox1.Text.Trim();
          //判读是数组还是对象
          if (json.StartsWith("["))
          {
              JArray jobj = JArray.Parse(textBox1.Text);
              textBox1.Text = jobj.ToString();
          }
          else if (json.StartsWith("{"))
          {
              JObject jobj = JObject.Parse(textBox1.Text);
              textBox1.Text = jobj.ToString();
          }

}
      catch (Exception ex)
      {
          MessageBox.Show("错误的JSON");

}
  }

//清空
  private void btnClear_Click(object sender, EventArgs e)
  {
      textBox1.Text = "";
  }
```

![](/media/202409/2024-09-20_183121_8361060.6640109743408923.gif)