地磅称量系统之(53)在封装对象的类库中实现包括IDataErrorInfo接口提供的所有方法和并且扩展对异常具有添加和删除功能的基本业务对象基类

 

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地磅称量系统

 

53. 在LWSMapping封装对象的类库中新建一名称为BaseBusiness的基本业务对象基类

代码如下：

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.ComponentModel;

 

namespace LWSMapping

{

    public class BaseBusiness : IDataErrorInfo

    {

        private Dictionary<string, string> validationErrors;

        public BaseBusiness()

        {

            this.validationErrors = new Dictionary<string, string>();

        }

        protected void AddError(string columnName, string msg)

        {

            if (!this.validationErrors.ContainsKey(columnName))

            {

                this.validationErrors.Add(columnName, msg);

            }

        }

        protected void RemoveError(string columnName)

        {

            if (this.validationErrors.ContainsKey(columnName))

            {

                this.validationErrors.Remove(columnName);

            }

        }

 

        public string Error

        {

            get

            {

                if (this.validationErrors.Count > 0)

                {

                    return string.Format("{0} data is invalid.", this.GetType().ToString());

                }

                return null;

            }

        }

 

 

        public virtual bool HasErrors

        {

            get

            {

                return (this.validationErrors.Count > 0);

            }

        }

        public string this[string columnName]

        {

            get

            {

                if (this.validationErrors.ContainsKey(columnName))

                {

                    return this.validationErrors[columnName].ToString();

                }

                return null;

            }

        }

 

    }

}