Questions tagged [asp.net-core-3.0]
Use this tag for questions specifically related to ASP.NET Core 3.0, in addition to using the 'ASP.NET Core' tag.
asp.net-core-3.0
849
questions
202
votes
7
answers
156k
views
Where did IMvcBuilder AddJsonOptions go in .Net Core 3.0?
I've just upgraded my ASP web API project from .NET Core 2.0 to 3.0. I was using
services.AddMvc()
.AddJsonOptions(opts => opts.SerializerSettings.ContractResolver
= new ...
- 3,437
159
votes
3
answers
53k
views
ASP.NET Core 2.2 -> 3.0 upgrade. env.IsDevelopment() not found
I upgraded an existing 2.2 project to 3.0. I copied the new code for Program/Startup from a new 3.0 project to my existing 2.2 project. It worked, but the IsDevelopment() below:
public void Configure(...
- 12.2k
126
votes
9
answers
55k
views
.NET Core 3.0: Razor views don't automatically recompile on change
According to the documentation, Razor views should, by default, recompile on change on local environments for ASP.NET Core 3.0.
However, my project doesn't do this locally. If I change a view and ...
- 2,187
123
votes
6
answers
173k
views
How to set json serializer settings in asp.net core 3?
json serializer settings for legacy asp.net core applications were set by adding AddMvc().AddJsonOptions(), but I don't use AddMvc() in asp.net core 3. So how can I set global json serialization ...
- 2,726
104
votes
5
answers
69k
views
ASP.NET MVC Core API Serialize Enums to String
How to serialize Enum fields to String instead of an Int in ASP.NET MVC Core 3.0? I'm not able to do it the old way.
services.AddMvc().AddJsonOptions(opts =>
{
opts.JsonSerializerOptions....
- 43.9k
98
votes
5
answers
83k
views
'IHostingEnvironment' is obsolete
I updated my ASP.NET Core project to .NET Core v3.0.0-preview3, and I now get:
Startup.cs(75,50,75,69): warning CS0618: 'IHostingEnvironment' is
obsolete: 'This type is obsolete and will be ...
- 18.7k
92
votes
5
answers
80k
views
Application is running inside IIS process but is not configured to use IIS server .NET Core 3.0
I have migrated our application from .NET Core 2.2 to version 3.0. Actually I created the new application in 3.0 from scratch and then copied source code files. Everything looks great but when I try ...
- 3,448
87
votes
18
answers
102k
views
ASP.NET Core 3.0 not showing on Visual Studio 2019
I want to test the new Blazor server-side framework (aka Razor Components).
I installed Visual Studio 2019 RC, and then the .Net Core 3.0 preview 2, following this official tutorial.
After the ...
- 5,301
87
votes
2
answers
36k
views
What is the alternate of HttpRequest.EnableRewind() in ASP.NET Core 3.0?
BufferingHelper.EnableRewind();
Above is an extension method for HttpRequest object in ASP.NET Core 2.2. It is no more there in ASP.NET Core 3.0 (atleast with this name). I want to know it's ...
- 1,150
71
votes
6
answers
50k
views
How to read configuration settings before initializing a Host in ASP .NET Core?
Before initializing the application Host I need to read some settings from the application's configuration to setup some other things.
In ASP .NET Core 2.x to read settings before initializing the ...
- 1,338
69
votes
11
answers
101k
views
ASP.NET Core 3.0 [FromBody] string content returns "The JSON value could not be converted to System.String."
Using [FromBody] string content on an ApiController in ASP.NET Core 3.0 returns a validation error:
{"type": "https://tools.ietf.org/html/rfc7231#section-6.5.1",
"title":"One or more validation ...
- 17.4k
64
votes
10
answers
64k
views
Ignore property when null using the new Net Core 3.0 Json
When using JSON.Net in ASP.Net Core 2.2 I was able to ignore a property when its value was null when serializing to JSON:
[JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
public DateTime? ...
- 38.6k
61
votes
2
answers
22k
views
What is the difference between Host and WebHost class in asp.net core
I was trying to migrate the my application from asp.net core 2.1 to 3.0 and there come a first suggested change in program.cs for creation of host.
asp.net core 2.1 program.cs
public static void ...
- 1,508
51
votes
21
answers
97k
views
Unable to connect to web server 'IIS Express'
I am using Microsoft Visual Studio 2019 Community preview, version 16.4.0 Preview 1.0. I just updated to Windows 10 Pro Version 1903 OS build 18362.418. With an ASP.NET Core 3 web app project (Blazor ...
- 50.8k
51
votes
8
answers
28k
views
.Net Core 3.0 JsonSerializer populate existing object
I'm preparing a migration from ASP.NET Core 2.2 to 3.0.
As I don't use more advanced JSON features (but maybe one as described below), and 3.0 now comes with a built-in namespace/classes for JSON, ...
- 86.5k