- StringLength Attribute :
Used to enforce minimum and maximum length of characters that are allowed in a data field. Let's understand this with an example.
Namespace:
System.ComponentModel.DataAnnotations
[MetadataType(typeof(EmployeeMetaData))] public partial class Employee { } public class EmployeeMetaData { [StringLength (10,MinimumLength =5)] public string Name { get; set; }
}
- Range Attribute
Range attribute is used to validate DateTime fields, numeric fields.
[MetadataType(typeof(EmployeeMetaData))] public partial class Employee { } public class EmployeeMetaData { [StringLength (10,MinimumLength =5)] public string Name { get; set; } [Range(1,100)] public string Age { get; set; }
[Range(typeof(DateTime),"01/01/2010","01/01/2018")]
public DateTime? DateofJoin { get; set; }
}
- Regular Expression Attribute
Regular expression attribute is used for pattern matching validation.
[MetadataType(typeof(EmployeeMetaData))] public partial class Employee { } public class EmployeeMetaData { [RegularExpression(@"^(([A-za-z]+[\s]{1}[A-za-z]+)|([A-Za-z]+))$")] [StringLength (10,MinimumLength =5)] public string Name { get; set; }
}
Or
[RegularExpression(@"^(([A-za-z]+[\s]{1}[A-za-z]+)|([A-Za-z]+))$",ErrorMessage = "Only upper and lower case alphabets are allowed")] [StringLength (10,MinimumLength =5)]public string Name { get; set; }
- Compare Attribute
Compare attribute is used to compare 2 properties of a model.
[MetadataType(typeof(EmployeeMetaData))] public partial class Employee { [Compare("Name")] public string confirmName { get; set; } } public class EmployeeMetaData { [RegularExpression(@"^(([A-za-z]+[\s]{1}[A-za-z]+)|([A-Za-z]+))$",ErrorMessage = "Only upper and lower case alphabets are allowed")] [StringLength (10,MinimumLength =5)] public string Name { get; set; }
}
- Required Attribute
This is used to enforce the property is required
[MetadataType(typeof(EmployeeMetaData))] public partial class Employee { } public class EmployeeMetaData { [Required] public string Name { get; set; } [Required] public string Designation { get; set; }
}
- Display Attribute
This is used to display change the caption (Overrides auto generated name)
[MetadataType(typeof(DepartmentMetaData))]
public partial class Department
{
}
public class DepartmentMetaData
{
[Display(Name="Department Name")]
public string Name { get; set; }
}
- DisplayName Attribute
Namespace: using System.ComponentModel;
[DisplayName("Employee Name")] public string Name { get; set; }
- DispalyAttribute Attribute
[DisplayAttribute(Name="Employee Name")] public string Name { get; set; }
- DisplayFormat Attribute
If gender is NULL, "Gender not specified" text will be displayed.[DisplayFormat(NullDisplayText = "Gender not specified")] public string Gender { get; set; }
- ScaffoldColumn Attribute
If you don't want to display a column use ScaffoldColumn attribute. This only works when you use @Html.DisplayForModel() helper[ScaffoldColumn(false)] public int? Salary { get; set; }
datatype Attribute
Used to specify specific data type in the model.[DataType(DataType.EmailAddress)] public string EmailAddress { get; set; }[DataType(DataType.Currency)] public int? Salary { get; set; }[DataType(DataType.Url)] public string PersonalWebSite { get; set; }[DataType(DataType.Date)] public DateTime? HireDate { get; set; }
