利用单元测试，我们可以找出很多意想不到的问题，在Nunit对项目进行单元测试 过程中就查找出了很多隐藏的问题，下面是单元测试中遇到的问题与解决方案：

1.TQL_Part表
1.1问题1
下面是项目中的代码：
  /**//// <summary>
        /// 根据taskid，获得对应的Part记录
        /// </summary>
        /// <param name="taskId"></param>
        /// <returns></returns>
        public WYEng.Model.TQL_Part GetPaperPart(int taskId)
        ...{
            SqlParameter[] parm = new SqlParameter[1];
            parm[0] = new SqlParameter(PARM_TASKID, SqlDbType.Int);
            parm[0].Value = taskId;
            WYEng.Model.TQL_Part part = new WYEng.Model.TQL_Part();

            using (SqlDataReader rdr = XPWY.DBUtility.DBHelperSQL.ExecuteReader(SQL_SELECT_PART, parm))
            ...{

                while (rdr.Read())
                ...{
                    part.PartCode = rdr.GetString(0);
                    part.SetCode = rdr.GetString(1);
                    part.SubjectId = rdr.GetInt32(2);
                    part.DisplayOrder = rdr.GetInt32(3);
                    part.Description = rdr.GetString(4);
                }

            }
            return part;
        }
写测试用例如下：
using System;
using System.Collections.Generic;
using System.Text;
using NUnit.Framework;
using WYEng.SQLServerDAL;

namespace WYEng.TestUnit
...{
    [TestFixture]
    public class TQL_Part
    ...{
        SQLServerDAL.TQL_Part part;
        WYEng.Model.TQL_Part p;
        [SetUp]
        public void CreateObject()
        ...{
            part = new WYEng.SQLServerDAL.TQL_Part();
            p=new WYEng.Model.TQL_Part();
        }

        [TearDown]
        public void DeleteObject()
        ...{
            part = null;
            p=null;
        }

        [Test]
        public void GetPaperPart()
        ...{
            //输入TaskId的值，然后可以获取其Part所有信息
            p = part.GetPaperPart(1); //正常情况
            Assert.AreEqual(p.PartCode, "6666");
        }
    }
}运行Nunit，状态条为红色，经检查发现原因是
model层中的TQL_PArt的description下的代码段有问题
 if (value != null && value.Length > 50)
                    throw new ArgumentOutOfRangeException("Invalid value for Description", value, value.ToString());
数据库中description的字段为Varchar(500),而这里只为50，现在更正为 if (value != null && value.Length > 50)
修正后，运行后的状态条为绿色。