protected override IEnumerable <Expression> CreateExpressionCore(CreatePropertyValidatorInput input)
{
if (input.PropertyInfo.PropertyType.GetInterfaces().Any(x => x == typeof(IEnumerable <T>)))
{
yield return(CreateValidateExpression(input, Func()));
}
}
protected Expression CreateValidateExpression(
CreatePropertyValidatorInput input,
Expression <Func <string, TValue, ValidateResult> > validateFuncExpression)
{
var propertyInfo = input.PropertyInfo;
var isOkProperty = typeof(ValidateResult).GetProperty(nameof(ValidateResult.IsOk));
Debug.Assert(isOkProperty != null, nameof(isOkProperty) + " != null");
var convertedExp = Expression.Convert(input.InputExpression, input.InputType);
var propExp = Expression.Property(convertedExp, propertyInfo);
var nameExp = Expression.Constant(propertyInfo.Name);
var requiredMethodExp = Expression.Invoke(
validateFuncExpression,
nameExp,
propExp);
var assignExp = Expression.Assign(input.ResultExpression, requiredMethodExp);
var resultIsOkPropertyExp = Expression.Property(input.ResultExpression, isOkProperty);
var conditionExp = Expression.IsFalse(resultIsOkPropertyExp);
var ifThenExp =
Expression.IfThen(conditionExp,
Expression.Return(input.ReturnLabel, input.ResultExpression));
var re = Expression.Block(
new[] { input.ResultExpression },
assignExp,
ifThenExp);
return(re);
}
public virtual IEnumerable <Expression> CreateExpression(CreatePropertyValidatorInput input)
{
if (input.PropertyInfo.PropertyType != typeof(T))
{
return(Enumerable.Empty <Expression>());
}
return(CreateExpressionCore(input));
}
protected override IEnumerable<Expression> CreateExpressionCore(CreatePropertyValidatorInput input)
{
if (input.PropertyInfo.GetCustomAttribute<MinLengthAttribute>() is { } v)
{
Expression<Func<string, bool>> checkbodyExp = x => string.IsNullOrEmpty(x) || x.Length < v.Length;
Expression<Func<string, string>> ErrMessageExp = (s) => $"Length of {s} should be great than {v.Length}";
yield return CreateValidateExpression(input, ExpressionHelper.CreateCheckerExpression(typeof(string), checkbodyExp, ErrMessageExp));
}
}
protected override IEnumerable <Expression> CreateExpressionCore(CreatePropertyValidatorInput input)
{
if (input.PropertyInfo.GetCustomAttribute <MinLengthAttribute>() is { } p)
{
Expression <Func <int, bool> > checkbodyExp = x => x.ToString().Length < p.Length;
Expression <Func <string, string> > ErrMessageExp = (s) => $"Value if {s} should be great then {p.Length}";
yield return(CreateValidateExpression(input, ExpressionHelper.CreateCheckerExpression(typeof(int), checkbodyExp, ErrMessageExp)));
}
}
protected override IEnumerable <Expression> CreateExpressionCore(CreatePropertyValidatorInput input)
{
if (input.PropertyInfo.GetCustomAttribute <RangeAttribute>() is RangeAttribute p)
{
Expression <Func <int, bool> > checkbodyExp = x => x <(int)p.Minimum || x> (int) p.Maximum;
Expression <Func <string, string> > ErrMessageExp = (s) => $"{s} must range in {p.Minimum} and {p.Maximum}";
yield return(CreateValidateExpression(input, ExpressionHelper.CreateCheckerExpression(typeof(int), checkbodyExp, ErrMessageExp)));
}
}
protected override IEnumerable <Expression> CreateExpressionCore(CreatePropertyValidatorInput input)
{
if (input.PropertyInfo.GetCustomAttribute <RequiredAttribute>() is not null)
{
Expression <Func <string, bool> > checkbodyExp = x => string.IsNullOrEmpty(x);
Expression <Func <string, string> > ErrMessageExp = x => $"missing {x}";
yield return(CreateValidateExpression(input, ExpressionHelper.CreateCheckerExpression(typeof(string), checkbodyExp, ErrMessageExp)));
}
}
protected override IEnumerable <Expression> CreateExpressionCore(CreatePropertyValidatorInput input)
{
var propertyInfo = input.PropertyInfo;
if (propertyInfo.GetCustomAttribute <RequiredAttribute>() != null)
{
yield return(CreateValidateExpression(input, CreateValidateStringRequiredExp()));
}
}
private IEnumerable <Expression> GetExpressions(CreatePropertyValidatorInput input)
{
{
var argType = input.PropertyInfo.PropertyType.GetGenericArguments().First();
var inputType = typeof(IEnumerable <>).MakeGenericType(argType);
Expression checkbodyExp = CreateCheckBodyExpression(argType);
Expression <Func <string, string> > ErrMessageExp = x => $"{x} must has any";
var r = (Expression)(this.GetType().GetMethod(nameof(CreateValidateExpression)).MakeGenericMethod(input.PropertyInfo.PropertyType.GetGenericArguments()).Invoke(this, new object[] { input, ExpressionHelper.CreateCheckerExpression(typeof(IEnumerable <>).MakeGenericType(argType), checkbodyExp, ErrMessageExp) }));
yield return(r);
}
}
protected override IEnumerable <Expression> CreateExpressionCore(CreatePropertyValidatorInput input)
{
var propertyInfo = input.PropertyInfo;
var minlengthAttribute = propertyInfo.GetCustomAttribute <MinLengthAttribute>();
if (minlengthAttribute != null)
{
yield return(CreateValidateExpression(input,
CreateValidateStringMinLengthExp(minlengthAttribute.Length)));
}
}
public virtual IEnumerable <Expression> CreateExpression(CreatePropertyValidatorInput input)
{
if (input.PropertyInfo.PropertyType == typeof(string))
{
return(Enumerable.Empty <Expression>());
}
if (input.PropertyInfo.PropertyType.GetInterfaces().Any(x => x.IsGenericType && x.GetGenericTypeDefinition().IsAssignableFrom(typeof(IEnumerable <>))))
{
return(GetExpressions(input));
}
return(Enumerable.Empty <Expression>());
}
protected Expression CreateValidateExpression(CreatePropertyValidatorInput input, Expression validateFuncExpression)
{
var propertyInfo = input.PropertyInfo;
var isOkProperty = typeof(ValidateResult).GetProperty(nameof(ValidateResult.IsOK));
var convertExp = Expression.Convert(input.InputExpression, input.InputType);
var propExp = Expression.Property(convertExp, propertyInfo);
var nameContestExp = Expression.Constant(propertyInfo.Name, typeof(string));
var requiredMethodExp = Expression.Invoke(validateFuncExpression, nameContestExp, propExp);
var assignExp = Expression.Assign(input.ResultExpression, requiredMethodExp);
var resultIsOkExp = Expression.Property(input.ResultExpression, isOkProperty);
var ifthenExp = Expression.IfThen(Expression.IsFalse(resultIsOkExp), Expression.Return(input.ReturnLabel, input.ResultExpression));
return(Expression.Block(assignExp, ifthenExp));
}
protected abstract IEnumerable <Expression> CreateExpressionCore(CreatePropertyValidatorInput input);
