关于画面内容的check的设计

首先定义接口

public interface IValidator {

    void Validate(object value);}

及虚类

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;    }}

然后定义各个具体的check类,比如只能输入半角英数字的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 = "请输入半角英数字";    }} 

最后定义容器

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;    }}

 

画面类追加例

            this.validator = new ActiveValidator(this.errorProvider);

            this.validator.AddValidator(this.TextBox1, new AlphabetAndNumberValiator());

同时,在提交button的click事件中,也可以调用this.validator.DoAllValidation(),做全画面注册控件的check.