call singleton method in program.cs

Question

How do i call this 'LoadCashe' method from my service?

My goal is to load a cashe, before the razor pages run. The cashe should never be null. Its on WebAssembly, if that might matter.

[ what i have tried ]

i have heard about factory methods.

i have seen this: https://learn.microsoft.com/en-us/aspnet/core/fundamentals/dependency-injection?view=aspnetcore-5.0 (see Call services From Main) But, i do not see similarities between this version of program.cs and mine. Plus i do not understand the example enough to make sure i do it as robustly as intended.

Answer 1

Just pass preallocated object

var api = new ApiClient();  
api.LoadCache();  
builder.Services.AddSingleton<ApiClient>(api);