//第一種方式
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,//縮進字符數(shù)
                  IndentChar = ' '//縮進字符
              };
              serializer.Serialize(jsonWriter, obj);
              textBox1.Text = textWriter.ToString();
          }
 
      }
      catch (Exception ex)
      {
          MessageBox.Show("錯誤的JSON");
 
      }
  }
 
//第二種方式
  private void btnFormat2_Click(object sender, EventArgs e)
  {
      if (textBox1.Text.Length == 0)
      {
          return;
      }
      try
      {
          //JObject.ToString()方法會內部調用格式化，所以直接使用即可
          string json = textBox1.Text.Trim();
          //判讀是數(shù)組還是對象
          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("錯誤的JSON");
 
      }
  }
 
//清空
  private void btnClear_Click(object sender, EventArgs e)
  {
      textBox1.Text = "";
  }