[英]Proper way to rethrow a JsonConverter exception
I have the following setup for deserializing some json:我有以下设置用于反序列化一些 json:
parsedResponse = JsonConvert.DeserializeObject<T>(
json,
new JsonSerializerSettings
{
Error = (object sender, ErrorEventArgs args) =>
{
throw new MyParseException($"Parse error: {args.ErrorContext.Error.Message}");
},
Converters =
{
new MyItemConverter(),
new BoolConverter(),
new UnixDateTimeConverter(),
new NullableIntConverter(),
new UriConverter()
}
}
);
In one case, json
has a bunch of null values (like "title" : null,
etc) which causes a NullReferenceException in one of my converters.在一种情况下,
json
有一堆空值(如"title" : null,
等),这会在我的一个转换器中导致 NullReferenceException。 But throwing MyParseException
in the error handler causes但是在错误处理程序中抛出
MyParseException
会导致
System.InvalidOperationException: Current error context error is different to requested error.
System.InvalidOperationException:当前错误上下文错误与请求的错误不同。
I think I could do this instead:我想我可以这样做:
try
{
parsedResponse = JsonConvert.DeserializeObject<T>(
json,
new JsonSerializerSettings
{
Converters =
{
new MyItemConverter(),
new BoolConverter(),
new UnixDateTimeConverter(),
new NullableIntConverter(),
new UriConverter()
}
}
);
}
catch (Exception ex)
{
throw new MyParseException($"Parse error: {ex.Message}");
}
But is there a better way?但是有更好的方法吗? (Maybe something more similar to my original solution that doesn't cause the error context issue?)
(也许更类似于我的原始解决方案不会导致错误上下文问题?)
Based on the Newtonsoft example here: https://www.newtonsoft.com/json/help/html/serializationerrorhandling.htm I ended up doing the following:基于此处的 Newtonsoft 示例: https : //www.newtonsoft.com/json/help/html/serializationerrorhandling.htm我最终执行了以下操作:
List<MyParseException> errors = new List<MyParseException>();
T parsedResponse = JsonConvert.DeserializeObject<T>(
json,
new JsonSerializerSettings
{
Error = (object sender, ErrorEventArgs args) =>
{
errors.Add(new MyParseException(String.Format("Parse error: {0}", args.ErrorContext.Error.Message), args.ErrorContext.Error));
args.ErrorContext.Handled = true;
},
Converters =
{
new MyItemConverter(),
new BoolConverter(),
new UnixDateTimeConverter(),
new NullableIntConverter(),
new UriConverter()
}
}
);
if (errors.Count == 1)
{
MyParseException firstException = errors[0];
firstException.Data["json"] = json;
throw firstException;
}
else if (errors.Count > 1)
{
AggregateException ex = new AggregateException("Unable to parse json. See innner exceptions and exception.Data[\"json\"] for details", errors);
ex.Data["json"] = json;
throw ex;
}
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