public async Task InvokeAsync([NotNull] ViewComponentContext context)
{
IViewComponentResult result;
var asyncMethod = ViewComponentMethodSelector.FindAsyncMethod(
context.ViewComponentDescriptor.Type.GetTypeInfo(),
context.Arguments);
if (asyncMethod == null)
{
// We support falling back to synchronous if there is no InvokeAsync method, in this case we'll still
// execute the IViewResult asynchronously.
var syncMethod = ViewComponentMethodSelector.FindSyncMethod(
context.ViewComponentDescriptor.Type.GetTypeInfo(),
context.Arguments);
if (syncMethod == null)
{
throw new InvalidOperationException(
Resources.FormatViewComponent_CannotFindMethod_WithFallback(
ViewComponentMethodSelector.SyncMethodName, ViewComponentMethodSelector.AsyncMethodName));
}
else
{
result = InvokeSyncCore(syncMethod, context);
}
}
else
{
result = await InvokeAsyncCore(asyncMethod, context);
}
await result.ExecuteAsync(context);
}
public void FindAsyncMethod_ReturnsNull_IfMatchCannotBeFound(Type type, object[] args)
{
// Arrange
var typeInfo = type.GetTypeInfo();
// Act
var method = ViewComponentMethodSelector.FindAsyncMethod(typeInfo, args);
// Assert
Assert.Null(method);
}
public void FindAsyncMethod_ThrowsIfInvokeAsyncDoesNotHaveCorrectReturnType(object[] args)
{
// Arrange
var typeInfo = typeof(TypeWithInvalidInvokeAsync).GetTypeInfo();
// Act and Assert
var ex = Assert.Throws <InvalidOperationException>(
() => ViewComponentMethodSelector.FindAsyncMethod(typeInfo, args));
Assert.Equal("The async view component method 'InvokeAsync' should be declared to return Task<T>.",
ex.Message);
}
public void FindAsyncMethod_ReturnsMethodMatchingParameters(Type type, object[] args, string expectedId)
{
// Arrange
var typeInfo = type.GetTypeInfo();
// Act
var method = ViewComponentMethodSelector.FindAsyncMethod(typeInfo, args);
// Assert
Assert.NotNull(method);
var data = method.GetCustomAttribute <MethodDataAttribute>();
Assert.Equal(expectedId, data.Data);
}
