為什么80%的碼農都做不了架構師？>>> ??

關于畫面內容的check的設計

首先定義接口

public interface IValidator {
??? void Validate(object value);
}

及虛類

public abstract class AbstractValidator {

??? private string errorMessage;
??? public string ErrorMessage {
??????? get { return errorMessage; }
??????? set { errorMessage = value; }
??? }

??? protected bool IsEmptyString(object obj) {
??????? if (obj == null || obj.ToString() == string.Empty) {
??????????? return true;
??????? } else {
??????????? return false;
??????? }
??? }

??? public AbstractValidator() {
??????? return;
??? }
}

然后定義各個具體的check類,比如只能輸入半角英數字的check

public class AlphabetAndNumberValiator : AbstractValidator, IValidator {

??? public void Validate(Object value) {
??????? Regex regex = new Regex(@"[a-zA-Z0-9]");
??????? if (!regex.IsMatch(value.ToString())) {
??????????? throw new ValidatorException(this.ErrorMessage);
??????? }
??? }

??? public AlphabetAndNumberValiator() {
??????? this.ErrorMessage = "請輸入半角英數字";
??? }
}?

最后定義容器

public class ActiveValidator {

??? private ErrorProvider errorProvider;

??? private Dictionary<Control, List<IValidator>> dic = new Dictionary<Control, List<IValidator>>();

??? private bool isAutoAddEventHandler = true;
??? public bool IsAutoAddEventHandler {
??????? get { return isAutoAddEventHandler; }
??????? set { isAutoAddEventHandler = value; }
??? }

??? public void AddValidator(Control control, IValidator validator) {
??????? if (dic.ContainsKey(control)) {
??????????? if (dic[control].Contains(validator) == false) {
??????????????? dic[control].Add(validator);
??????????? }
??????? } else {
??????????? List<IValidator> list = new List<IValidator>();
??????????? list.Add(validator);
??????????? dic.Add(control, list);
??????????? control.Validating += new CancelEventHandler(this.DoValidation);
??????? }
??? }

??? public bool DoAllValidation() {
??????? this.errorProvider.Clear();
??????? bool ret = false;
??????? foreach (Control control in dic.Keys) {
??????????? foreach (IValidator validator in dic[control]) {
??????????????? try {
??????????????????? validator.Validate(control.Text);
??????????????? } catch (ValidatorException ex) {
??????????????????? this.errorProvider.SetError(control, ex.Message);
??????????????????? ret = true;
??????????????? }
??????????? }
??????? }
??????? return ret;
??? }

??? private void DoValidation(object sender, EventArgs e) {
??????? if (this.isAutoAddEventHandler) {
??????????? this.errorProvider.Clear();
??????????? Control control;
??????????? if (sender is Control) {
??????????????? control = (Control)sender;
??????????? } else {
??????????????? return;
??????????? }
??????????? List<IValidator> list;
??????????? if (dic.ContainsKey(control)) {
??????????????? list = dic[control];
??????????? } else {
??????????????? return;
??????????? }
??????????? foreach (IValidator validator in list) {
??????????????? try {
??????????????????? validator.Validate(control.Text);
??????????????? } catch (ValidatorException ex) {
??????????????????? this.errorProvider.SetError(control, ex.Message);
??????????????????? // TODO
??????????????? }
??????????? }
??????? }
??? }

??? public ActiveValidator(ErrorProvider errorProvider) {
??????? this.errorProvider = errorProvider;
??? }
}

?

畫面類追加例

??????????? this.validator = new ActiveValidator(this.errorProvider);
??????????? this.validator.AddValidator(this.TextBox1, new AlphabetAndNumberValiator());

同時,在提交button的click事件中,也可以調用this.validator.DoAllValidation(),做全畫面注冊控件的check.

轉載于:https://my.oschina.net/cjkall/blog/195903

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