C# Winform 定义Models字段 属性限制输入

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using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Text;

public class Person {
private int m_iAge = 1;
private string m_sFirstname = "Unknown";
private string m_sLastname = "";
private string m_sGroupCode = "AAA";

[Required(ErrorMessage = "Age is a required field.")]
[Range(1, 100, ErrorMessage = "A persons age must be between 1 and 100.")]
public int Age
{
    get { return m_iAge; }
    set { m_iAge = value; }
}

[Required(ErrorMessage = "Firstname is a required field.")]
public string Firstname
{
    get { return m_sFirstname; }
    set { m_sFirstname = value; }
}

public string Lastname
{
    get { return m_sLastname; }
    set { m_sLastname = value; }
}

[StringLength(3, MinimumLength = 3)]
public string GroupCode
{
    get { return m_sGroupCode; }
    set { m_sGroupCode = value; }
}

public void Validate() {
    ValidationContext context = new ValidationContext(this, serviceProvider: null, items: null);
    List<ValidationResult> results = new List<ValidationResult>();
    bool isValid = Validator.TryValidateObject(this, context, results, true);

    if (isValid == false) {
        StringBuilder sbrErrors = new StringBuilder();
        foreach (var validationResult in results) {
            sbrErrors.AppendLine(validationResult.ErrorMessage);
        }
        throw new ValidationException(sbrErrors.ToString());
    }
}
}

自定验证属性义类型
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class IsUnique : ValidationAttribute
    {
        public IsUnique(string propertyNames)
        {
            this.PropertyNames = propertyNames;
        }

        public string PropertyNames { get; private set; }

        protected override ValidationResult IsValid(object value, ValidationContext validationContext)
        {

            var myproperty = validationContext.ObjectType.GetProperty(PropertyNames);
            var value = propiedad.GetValue(validationContext.ObjectInstance, null);

            IEnumerable<String> properties;

            List<string> propertiesList = new List<string>();
            propertiesList.Add(myproperty.Name);

            var dba = new myContext();

            if (dba.Articles.Any(article => article.Name == (string)value))
            {
                return new ValidationResult("The name already exist", propertiesList);
            }
            return null;
        }
    }

使用

   lstStatus.Items.Add("Creating a good person");
            Person Jeff = new Person();
            Jeff.Age = 33;
            Jeff.Firstname = "Jeff";
            Jeff.Lastname = "Jefferson";
            Jeff.GroupCode = "JJJ";
            // LOOK! This line was added
            Jeff.Validate();

            CollectionOfPeople.Add(Jeff);