WPF驗(yàn)證技巧講解
WPF驗(yàn)證的實(shí)現(xiàn)方式比較靈活，對(duì)于初學(xué)者來說掌握起來并不是非常的輕松。我們?cè)谶@里為大家詳細(xì)介紹了具體的操作方法，希望對(duì)大家有所幫助。#t#
一.兩步實(shí)現(xiàn)WPF驗(yàn)證
(1)實(shí)現(xiàn)INotifyPropertyChanged接口,并為驗(yàn)證的屬性添加需要驗(yàn)證的元數(shù)據(jù)
- [StringLengthValidator(1, 10,
MessageTemplate = "First Name
must be between 1 and 15 characters")] - public string FirstName
- {
- get { return this.firstName; }
- set
- {
- this.firstName = value;
- this.OnPropertyChanged("FirstName");
- }
- }
(2)在前端使用Validizor控件,為后端驗(yàn)證顯示錯(cuò)誤
- < Validizor Source="
{Binding FirstName}"/>- < TextBox Text="{Binding
FirstName,UpdateSource
Trigger=PropertyChanged}"/>
WPF驗(yàn)證二.使用EnterpriseLibrary驗(yàn)證組
(1)指定元數(shù)據(jù)Ruleset屬性
- [StringLengthValidator(1, 20,
MessageTemplate = "Last Name
must be between 1 and 20
characters", Ruleset = "Default")]- public string LastName
- {
- get { return this.lastName; }
- set
- {
- this.lastName = value;
- this.OnPropertyChanged("LastName");
- }
- }
(2)前端控件同時(shí)指定Ruleset屬性
- < Validizor Source=
"{Binding LastName}"
Ruleset="Default">
三.內(nèi)置WPF驗(yàn)證的缺陷
(1)ui錯(cuò)誤無法變更,驗(yàn)證的不僅僅只是TextBox(3.5 sp1 可以把錯(cuò)誤信息轉(zhuǎn)嫁)
wpf內(nèi)置驗(yàn)證的做法,自定義ValidationRule
(2)若使用了內(nèi)置驗(yàn)證做法,控件的驗(yàn)證將會(huì)失效
四.兩個(gè)屬性以上的WPF驗(yàn)證
(1)單一的元數(shù)據(jù)標(biāo)簽無法做到，需要寫額外的方法進(jìn)行驗(yàn)證
(2)使用HasSelfValidation元數(shù)據(jù)標(biāo)簽驗(yàn)證對(duì)象
- [HasSelfValidation]
- public class Person2 :
INotifyPropertyChanged- {
- }
(3)添加驗(yàn)證方法
- [SelfValidation(Ruleset
= "Default")]- public void ValidateDefault
(ValidationResults results)- {
- }
(4)針對(duì)特定屬性來驗(yàn)證
(4)-1 實(shí)行IPropertyChangedName接口,根據(jù)進(jìn)來的屬性進(jìn)行判斷,可以填寫多個(gè)方法用于區(qū)分
- [SelfValidation(Ruleset =
"Default")]- public void ValidateDefault
(ValidationResults results)- {
- switch (this.PropertyChangedName)
- {
- case "FirstName":
- break;
- }
- }
- [SelfValidation(Ruleset =
"Default")]- public void ValidateDefault
(ValidationResults results)- {
- switch (this.PropertyChangedName)
- {
- case "LastName":
- break;
- }
- }
(5)前端控件指定
