Class PropertyValidationAttribute

Allows you to write a formula against properties that are automatically evaluated to validate changes

Inheritance
object
Attribute
ValidationAttribute
PropertyValidationAttribute
Inherited Members
Namespace: LemonEdge.API.Attributes.Validation
Assembly: LemonEdge.API.dll
Syntax
[AttributeUsage(AttributeTargets.Property, AllowMultiple = true)]
public class PropertyValidationAttribute : ValidationAttribute
Remarks

For instance you can validate properties using custom scripts like so:

public interface MyItem
{
    bool ValidateX { get; set; }

    [PropertyValidation(
        //checkOnLamda. Only validate this property if this returns true 
        "MyItem." + nameof(ValidateX),
        //validOnLamda. If returns false then the validation fails and the following message returns why
        //This script uses LemonEdge.Core.FormulaFunctionsWithContext. So you can access the Cache, User, and Updater. 
        //You can also write any c# script, not just a single line formula
        "var itemVaue = MyItem.AmountX; return itemValue > 100;",
        //message. Reason for validation failure
        "AmountX must be greater than 100 if ValidateX is true.")]
    Int16 AmountX { get; set; }
}

Constructors

PropertyValidationAttribute(string, string, string)

Validates this property whenever the item is changed

Declaration
public PropertyValidationAttribute(string checkOnLamda, string validOnLamda, string message)
Parameters
Type Name Description
string checkOnLamda

Only runs the validOnLamda check if this statement is true, otherwise it returns valid
string validOnLamda

valid if this check is true, false otherwise and returns message
string message

Returns message if validOnLamda is false

Properties

RequiresValidationContext

Declaration
public override sealed bool RequiresValidationContext { get; }
Property Value
Type Description
bool
Overrides

TypeId

Have to override this if AllowMultiple is true

Declaration
public override object TypeId { get; }
Property Value
Type Description
object
Overrides

Methods

IsValid(object, ValidationContext)

Declaration
protected override sealed ValidationResult IsValid(object value, ValidationContext validationContext)
Parameters
Type Name Description
object value
ValidationContext validationContext
Returns
Type Description
ValidationResult
Overrides

Extension Methods