Blazor Server + WebAPI/EF Core + NSwag = Cannot implicitly convert type 'System.Collections.Generic.ICollection<BtServer.Transaction>' to 'System.Collections.Generic.ICollection<BtClassLibrary.TransactionModel>

Question

User379720387 posted

Cannot implicitly convert type 'System.Collections.Generic.ICollection<BtServer.Transaction>' to 'System.Collections.Generic.ICollection<BtClassLibrary.TransactionModel>'. An explicit conversion exists (are you missing a cast?) 

BtApiCore (NET5.0) has the EF Core Entity Transaction in the Model folder

Blazor Server has NSwag that connects to BtApiCore

There is also a BtClassLibrary which has the TransactionModel

What is the problem here?

The squiggle is highlighted

@code {
    private ICollection<TransactionModel> transactions;
    //private DisplayListClientsModel listClient = new DisplayListClientsModel();
    
    protected override async Task OnInitializedAsync()
    {
        swaggerClient client = new("https://localhost:44317", http);
        transactions = await client.TransactionAsync(); 
    }


}

Answer 1

User475983607 posted

This is the same problem as your other thread.  You defined a member type as...

private ICollection<TransactionModel> transactions;

Then you try to stick a different type (ICollection<BtServer.Transaction>) into "transaction".

transactions = await client.TransactionAsync(); 

You can't do that!  As explained in your other thread C# is a strongly typed language.  The types must match. 

Answer 2

User379720387 posted

The code you helped me with that works:

private List<TransactionModel> transactions;
    
protected override async Task OnInitializedAsync()
{
    transactions = await _db.GetTransactions();
}

GetTransactions() returns public Task<List<TransactionModel>> GetTransactions()

Then the API version

private ICollection<TransactionModel> transactions;
    
protected override async Task OnInitializedAsync()
{
    swaggerClient client = new("https://localhost:44317", http);
    transactions = await client.
}

ICollection vs List, same TransactionModel

Then the highlighted: async client.

Intellisense gives me BaseUrl, Equals, GetHashCode, GetType, ReadResponseAsString, ToString, TransactionAsync, WeatherForecastAsync

Sorry, not seeing it.

Answer 3

User475983607 posted

Essentially you are trying to force a round peg in a square hole.  The problem you created is like this...

int num = "Hello World";

A string is not an int type and produces a cast error.

Answer 4

User379720387 posted

Made a change like this, and now it compiles:

private ICollection<BtServer.Transaction> transactions;

    protected override async Task OnInitializedAsync()
    {
        swaggerClient client = new("https://localhost:44317", http);
        transactions = await client.TransactionAsync();
    }