Troubleshooting

Unable to resolve service for type 'System.Net.Http.HttpClient' while attempting to activate... error

When I tried to register a service that uses an object of System.Net.Http.HttpClient  for dependency injection, I got this error "Unable to resolve service for type 'System.Net.Http.HttpClient' while attempting to activate "

Tags:  Troubleshooting

The 'async' modifier can only be used in methods that have a body.

I declared a method in my interface using the async modifier and I am getting the error "The 'async' modifier can only be used in methods that have a body"

Tags:  Troubleshooting

Solution For Blazor Error - Cannot provide a value for property, There is no registered service of type [TypeName]

While experimenting with Blazor, I ran into "There is no registered service of type [TypeName]" error. I was trying to use a new service on a Blazor component by injecting the service into it.

Tags:  Troubleshooting

HTTP Error 502.5 - ANCM Out-Of-Process Startup Failure

I got the following error when I deployed my ASP.NET Core Razor page application to the production server after updating some NuGet packages to the latest version. HTTP Error 502.5 - ANCM Out-Of-Process Startup Failure

Tags:  Troubleshooting

Unable to create an object of type '[DBContextName]'. For the different patterns supported at design time see https://go.microsoft.com/fwlink/?linkid=851728

You may get the following error when you run the add-migration command in EF Core 5.  Unable to create an object of type '[DBContextName]'. For the different patterns supported at design time, see https://go.microsoft.com/fwlink/?linkid=851728

Tags:  Troubleshooting

EF Core Migration Error: The query contains a projection '<>h_ Transparent Identifier 0 Collections in the final projection must be an 'IEnumerable<T>' type such as 'List<T>'.

The query contains a projection '<>h__TransparentIdentifier0 Collections in the final projection must be an 'IEnumerable' type such as 'List'. Consider using 'ToList' or some other mechanism to convert the 'IQueryable' or 'IOrderedEnumerable' into an 'IEnumerable'.

Tags:  Troubleshooting

The entity type 'X' requires a primary key to be defined. If you intended to use a keyless entity type, call 'HasNoKey' in 'OnModelCreating'

I got the following error when I ran the add-migration command for the following entity. The entity type 'Student' requires a primary key to be defined. If you intended to use a keyless entity type,call 'HasNoKey' in 'OnModelCreating'. For more information on keyless entity types, see https://go.microsoft.com/fwlink/?linkid=2141943.

Tags:  Troubleshooting

Fix: The term 'add-migration' is not recognized as the name of a cmdlet, function, script file, or operable program.

add-migration : The term 'add-migration' is not recognized as the name of a cmdlet, function, script file, or operable program.Check the spelling of the name, or if a path was included,verify that the path is correct and try again.

Tags:  Troubleshooting

The seed entity for entity type 'X' cannot be added because a non-zero value is required for property 'Id'

In Entity Framework Core, primary key properties are converted to identity columns if the database provider is SQL Server. But when we try to seed a database table with an identity column, the corresponding property value should be provided, as the migration scripts are generated by Entity Framework without connecting to the database.

Tags:  Troubleshooting

HTTP Error 500.34 - ASP.NET Core does not support mixing hosting models

"HTTP Error 500.34 - ASP.NET Core does not support mixing hosting models". You will get this error if you host two .NET Core web applications in the same application pool using In-process hosting. This error can be fixed using two methods. One solution is using different application pools for the web applications.  The other solution is changing the hosting model of the applications to "OutOfProcess". 

Tags:  Troubleshooting

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