+Jon Skeet, who is the expert on C# protos
On Mon, Oct 16, 2017 at 7:41 AM, <[email protected]> wrote:
> Using Google.Protobuf Nuget package version 3.4.1
>
> In its simplest form, I have a Google protocol-buffers message defined
> like this:
>
> syntax = "proto3";package tests;
> option csharp_namespace = "MyTests";
> import "wrappers.proto";
>
> message Foo {
> .google.protobuf.Int32Value NullableInt = 1;}
>
> I compile it to C# code using Google's protoc tool from
> Google.Protobuf.Tools version 3.4.0.
>
> When I instantiate an instance of Foo and serialize it to a string using
> the Google.Protobuf.JsonFormatter I get a sensible result, which is "{
> "NullableInt": 5 }". When I de-serialize this back into a Foo instance
> using Google.Protobuf.JsonParser, the parser throws a
> System.InvalidCastException stating "Unable to cast object of type
> 'System.Int32' to type 'Google.Protobuf.WellKnownTypes.Int32Value'."
>
> Why is this exception being thrown? Am I doing something stupid?
>
> Here is the code that I am running:
>
> [Test]public void TestRoundTripInt32Value(){
> var foramtter = new JsonFormatter(new JsonFormatter.Settings(false));
> var foo = new Foo { NullableInt = new Int32Value {Value = 5} };
> var str = foramtter.Format(foo);
> Console.WriteLine(str);
> var parser = new JsonParser(new JsonParser.Settings(100));
> var foo2 = parser.Parse<Foo>(str); // <= Throws!
> Assert.That(foo2, Is.EqualTo(foo));}
>
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