StringLengthAttribute Class

 

Specifies the minimum and maximum length of characters that are allowed in a data field.

Namespace:   System.ComponentModel.DataAnnotations
Assembly:  System.ComponentModel.DataAnnotations (in System.ComponentModel.DataAnnotations.dll)

System.Object
  System.Attribute
    System.ComponentModel.DataAnnotations.ValidationAttribute
      System.ComponentModel.DataAnnotations.StringLengthAttribute

[<AttributeUsageAttribute(AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter,
    AllowMultiple = false)>]
type StringLengthAttribute = 
    class
        inherit ValidationAttribute
    end

NameDescription
System_CAPS_pubmethodStringLengthAttribute(Int32)

Initializes a new instance of the StringLengthAttribute class by using a specified maximum length.

NameDescription
System_CAPS_pubpropertyErrorMessage

Gets or sets an error message to associate with a validation control if validation fails.(Inherited from ValidationAttribute.)

System_CAPS_pubpropertyErrorMessageResourceName

Gets or sets the error message resource name to use in order to look up the ErrorMessageResourceType property value if validation fails.(Inherited from ValidationAttribute.)

System_CAPS_pubpropertyErrorMessageResourceType

Gets or sets the resource type to use for error-message lookup if validation fails.(Inherited from ValidationAttribute.)

System_CAPS_protpropertyErrorMessageString

Gets the localized validation error message.(Inherited from ValidationAttribute.)

System_CAPS_pubpropertyMaximumLength

Gets or sets the maximum length of a string.

System_CAPS_pubpropertyMinimumLength

Gets or sets the minimum length of a string.

System_CAPS_pubpropertyRequiresValidationContext

Gets a value that indicates whether the attribute requires validation context.(Inherited from ValidationAttribute.)

System_CAPS_pubpropertyTypeId

When implemented in a derived class, gets a unique identifier for this Attribute.(Inherited from Attribute.)

NameDescription
System_CAPS_pubmethodEquals(Object)

This API supports the product infrastructure and is not intended to be used directly from your code. Returns a value that indicates whether this instance is equal to a specified object.(Inherited from Attribute.)

System_CAPS_protmethodFinalize()

Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.)

System_CAPS_pubmethodFormatErrorMessage(String)

Applies formatting to a specified error message.(Overrides ValidationAttribute.FormatErrorMessage(String).)

System_CAPS_pubmethodGetHashCode()

Returns the hash code for this instance.(Inherited from Attribute.)

System_CAPS_pubmethodGetType()

Gets the Type of the current instance.(Inherited from Object.)

System_CAPS_pubmethodGetValidationResult(Object, ValidationContext)

Checks whether the specified value is valid with respect to the current validation attribute.(Inherited from ValidationAttribute.)

System_CAPS_pubmethodIsDefaultAttribute()

When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class.(Inherited from Attribute.)

System_CAPS_pubmethodIsValid(Object)

Determines whether a specified object is valid.(Overrides ValidationAttribute.IsValid(Object).)

System_CAPS_protmethodIsValid(Object, ValidationContext)

Validates the specified value with respect to the current validation attribute.(Inherited from ValidationAttribute.)

System_CAPS_pubmethodMatch(Object)

When overridden in a derived class, returns a value that indicates whether this instance equals a specified object.(Inherited from Attribute.)

System_CAPS_protmethodMemberwiseClone()

Creates a shallow copy of the current Object.(Inherited from Object.)

System_CAPS_pubmethodToString()

Returns a string that represents the current object.(Inherited from Object.)

System_CAPS_pubmethodValidate(Object, String)

Validates the specified object.(Inherited from ValidationAttribute.)

System_CAPS_pubmethodValidate(Object, ValidationContext)

Validates the specified object.(Inherited from ValidationAttribute.)

NameDescription
System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr)

Maps a set of names to a corresponding set of dispatch identifiers.(Inherited from Attribute.)

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.GetTypeInfo(UInt32, UInt32, IntPtr)

Retrieves the type information for an object, which can be used to get the type information for an interface.(Inherited from Attribute.)

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.GetTypeInfoCount(UInt32)

Retrieves the number of type information interfaces that an object provides (either 0 or 1).(Inherited from Attribute.)

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr)

Provides access to properties and methods exposed by an object.(Inherited from Attribute.)

ASP.NET Dynamic Data enables CRUD (Create, Read, Update and Delete) operations in a data model. You can specify the minimum and maximum length of characters for each field when data is being inserted or updated. For character data types, the MinimumLength and MaximumLength properties identify the largest number of bytes that are required in order to store a string.

The following example shows how to limit the number of characters in a field. This example works with the ThumbnailPhotoFileName field in the Products table in the AdventureWorksLT database. The field is limited 4 characters by applying the StringLengthAttribute attribute to the partial class that represents the Product entity.

No code example is currently available or this language may not be supported.

Universal Windows Platform
Available since 8
.NET Framework
Available since 3.5
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 3.0

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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