public ValueTask InvokeAsync(IServerFilterContext context, Func <ValueTask> next)
{
var result = new DivideByResult {
IsSuccess = true
};
// invoke ValidateParameterAttribute.Validate for marked method parameters
var parameters = context.ServiceMethodInfo.GetParameters();
for (var i = 0; i < parameters.Length; i++)
{
var parameter = parameters[i];
foreach (var attribute in parameter.GetCustomAttributes <ValidateParameterAttribute>())
{
attribute.Validate(context.Request[i], parameter.Name, result);
}
}
if (!result.IsSuccess)
{
// skip the method: pass non-success result to the client
context.Response[0] = result;
return(new ValueTask(Task.CompletedTask));
}
// call the method
return(next());
}
public override void Validate(object parameterValue, string parameterName, DivideByResult result)
{
if (Equals(Value, parameterValue))
{
result.IsSuccess = false;
result.ErrorMessages.Add(string.Format("{0} cannot be {1}.", parameterName, Value));
}
}
public ValueTask <DivideByResult> DivideByAsync(int value, [Not(0), GreaterThan(10)] int divider, CancellationToken token)
{
var result = new DivideByResult
{
IsSuccess = true,
Result = value / divider
};
return(new ValueTask <DivideByResult>(result));
}
public override void Validate(object parameterValue, string parameterName, DivideByResult result)
{
if (parameterValue is int typedValue)
{
if (typedValue <= Value)
{
result.IsSuccess = false;
result.ErrorMessages.Add(string.Format("{0} must be greater than {1}.", parameterName, Value));
}
}
else
{
result.IsSuccess = false;
result.ErrorMessages.Add(string.Format("{0} must be Int32.", parameterName));
}
}
public abstract void Validate(object parameterValue, string parameterName, DivideByResult result);
