private static Func <ValueProviderResult, ModelBindingContext, object?> CreateTryParseOperation(Type modelType)
{
modelType = Nullable.GetUnderlyingType(modelType) ?? modelType;
var tryParseMethodExpession = ModelMetadata.FindTryParseMethod(modelType)
?? throw new InvalidOperationException(Resources.FormatTryParseModelBinder_InvalidType(modelType, nameof(TryParseModelBinder)));
// var tempSourceString = valueProviderResult.FirstValue;
// object model = null;
// if ([modeltype].TryParse(tempSourceString, [valueProviderResult.Culture,] out [modelType] parsedValue))
// {
// model = (object)parsedValue;
// bindingContext.Result = ModelBindingResult.Success(model);
// }
// else
// {
// AddModelError(bindingContext, new FormatException());
// }
// return model;
var parsedValue = Expression.Variable(modelType, "parsedValue");
var modelValue = Expression.Variable(typeof(object), "model");
var expression = Expression.Block(
new[] { parsedValue, modelValue, ParameterBindingMethodCache.TempSourceStringExpr },
Expression.Assign(ParameterBindingMethodCache.TempSourceStringExpr, ValueExpression),
Expression.IfThenElse(tryParseMethodExpession(parsedValue, CultureExpression),
Expression.Block(
Expression.Assign(modelValue, Expression.Convert(parsedValue, modelValue.Type)),
Expression.Assign(BindingResultExpression, Expression.Call(SuccessBindingResultMethod, modelValue))),
Expression.Call(AddModelErrorMethod, BindingContextExpression, Expression.Constant(new FormatException()))),
modelValue);
return(Expression.Lambda <Func <ValueProviderResult, ModelBindingContext, object?> >(expression, new[] { ValueProviderResultExpression, BindingContextExpression }).Compile());
}
