问题描述
我有一个原始字符串.我只想验证字符串是否是有效的 JSON.我正在使用 JSON.NET.
I have a raw string. I just want to validate whether the string is valid JSON or not. I'm using JSON.NET.
推荐答案
通过代码:
最好的办法是在 try-catch 中使用 parse 并在解析失败的情况下捕获异常.(我不知道有任何 TryParse 方法).
Your best bet is to use parse inside a try-catch and catch exception in case of failed parsing. (I am not aware of any TryParse method).
(使用 JSON.Net)
最简单的方法是使用 Parse 字符串JToken.Parse，并检查字符串是否以 { 或 [ 开头并以 } 或 ] 分别 (从这个 回答):
Simplest way would be to Parse the string using JToken.Parse, and also to check if the string starts with { or [ and ends with } or ] respectively (added from this answer):
private static bool IsValidJson(string strInput)
{
if (string.IsNullOrWhiteSpace(strInput)) { return false;}
strInput = strInput.Trim();
if ((strInput.StartsWith("{") && strInput.EndsWith("}")) || //For object
(strInput.StartsWith("[") && strInput.EndsWith("]"))) //For array
{
try
{
var obj = JToken.Parse(strInput);
return true;
}
catch (JsonReaderException jex)
{
//Exception in parsing json
Console.WriteLine(jex.Message);
return false;
}
catch (Exception ex) //some other exception
{
Console.WriteLine(ex.ToString());
return false;
}
}
else
{
return false;
}
}
为 { 或 [ 等添加检查的原因是基于 JToken.Parse 将解析值的事实例如 1234" 或 'a string'" 作为有效标记.另一种选择可能是在解析中同时使用 JObject.Parse 和 JArray.Parse 并查看其中是否有人成功，但我相信检查 {} 和 [] 应该更容易. (感谢@RhinoDevel 指出)
The reason to add checks for { or [ etc was based on the fact that JToken.Parse would parse the values such as "1234" or "'a string'" as a valid token. The other option could be to use both JObject.Parse and JArray.Parse in parsing and see if anyone of them succeeds, but I believe checking for {} and [] should be easier. (Thanks @RhinoDevel for pointing it out)
没有 JSON.Net
您可以使用 .Net framework 4.5 System.Json 命名空间，如:
You can utilize .Net framework 4.5 System.Json namespace ,like:
string jsonString = "someString";
try
{
var tmpObj = JsonValue.Parse(jsonString);
}
catch (FormatException fex)
{
//Invalid json format
Console.WriteLine(fex);
}
catch (Exception ex) //some other exception
{
Console.WriteLine(ex.ToString());
}
(但是，您必须使用以下命令通过 Nuget 包管理器安装 System.Json:PM>;Install-Package System.Json -Version 4.0.20126.16343在包管理器控制台上)(取自这里)
(But, you have to install System.Json through Nuget package manager using command: PM> Install-Package System.Json -Version 4.0.20126.16343 on Package Manager Console) (taken from here)
非编码方式:
通常，当有一个小的 json 字符串并且您试图在 json 字符串中查找错误时，我个人更喜欢使用可用的在线工具.我通常做的是:
Usually, when there is a small json string and you are trying to find a mistake in the json string, then I personally prefer to use available on-line tools. What I usually do is:
- 将 JSON 字符串粘贴到 JSONLint The JSON Validator 并查看是否它是一个有效的 JSON.
- 稍后将正确的 JSON 复制到 http://json2csharp.com/ 和为它生成一个模板类，然后反序列化它使用 JSON.Net.
- Paste JSON string in JSONLint The JSON Validator and see if its a valid JSON.
- Later copy the correct JSON to http://json2csharp.com/ and generate a template class for it and then de-serialize it using JSON.Net.
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