为什么有时候读某个类下的变量值时,得到的结果却是该变量所在的命名空间的呢?老师帮看看

Question

为什么有时候读某个类下的变量值时,得到的结果却是该变量所在的命名空间的呢?老师帮看看

代码:
string ss=combobox1.Text;

其中combobox1的选项已绑定到数据表,
可为什么最后ss的值为"Prj_2009.Comm.cmb绑定",而不是combobox1文本框中的内容呢?实在搞不清楚....

Prj_2009.Comm
...
public void cmb绑定(combobox cmb,DataTable dt)
{
            cmb.DataSource = dt
            cmb.DisplayMember = "名称";
            cmb.ValueMember = "代码";
}

Answer 1

你好 Text属性是指，获取或设置与此控件关联的文本 如果你没有设定 默认的就是这个类的FullName 如果你是想获取ComboBox的选定项的值 可以采用SelectedValue来读取

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Denn ich gehor nur dir!坚持不懈！http://hi.baidu.com/1987raymond

Answer 2

(同一段代码里有些combobox控件不出现题目所说的情况,不是全部)

SelectedValue值不是想要的,
如果SelectedValue的值为1,则对应的文本值为"一级医院"
我是想要文本值,该怎么读出来呢

Answer 3

你好！
     可以使用反射来获取，方法我在里的另外一个帖子里已经给你解释了啊！

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周雪峰

Answer 4

(同一段代码里有些combobox控件不出现题目所说的情况,不是全部)

SelectedValue值不是想要的,
如果SelectedValue的值为1,则对应的文本值为"一级医院"
我是想要文本值,该怎么读出来呢

hi,
    应该是使用ComboBox1.Text来获取控件显示的符串。ComboBox1.SelectedText获取选择项的字符。
你使用后面的属性试验一下。~

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Frank.Xu Lei--谦卑若愚，好学若饥
专注于.NET平台下分布式应用系统开发和企业应用系统集成
Focus on Distributed Applications Development and EAI based on .NET
老徐的博客：http://www.cnblogs.com/frank_xl

Answer 5

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace X.WinFormsApp
{
    public partial class X200905132241 : Form
    {
        private ComboBox comboBox1;
        private Button btnShowMessage;

        #region " Employee "

        private DataTable fEmployee;
        public DataTable Employee
        {
            get
            {
                if (fEmployee == null)
                {
                    fEmployee = new DataTable();

                    fEmployee.Columns.Add(new DataColumn("EmployeeKey", typeof(Int32)));
                    fEmployee.Columns.Add(new DataColumn("Name", typeof(String)));
                    fEmployee.Columns.Add(new DataColumn("ModifyDate", typeof(DateTime)));

                    fEmployee.Rows.Add(new object[] { 1, "John", DateTime.Now });
                    fEmployee.Rows.Add(new object[] { 2, "Tomi", DateTime.Now });
                    fEmployee.Rows.Add(new object[] { 3, "X.XY", DateTime.Now });
                    fEmployee.Rows.Add(new object[] { 4, "Sam", DateTime.Now });
                    fEmployee.Rows.Add(new object[] { 5, "Mary", DateTime.Now });
                    fEmployee.Rows.Add(new object[] { 6, "Chirs", DateTime.Now });
                }

                return fEmployee;
            }
        }

        #endregion

        public X200905132241()
        {
            InitializeComponent();
            this.InitClass();
        }

        private void InitClass()
        {
            this.comboBox1 = new ComboBox();
            this.btnShowMessage = new Button();

            this.comboBox1.DataSource = this.Employee;
            this.comboBox1.DisplayMember = "Name";
            this.comboBox1.ValueMember = "EmployeeKey";
            
            this.comboBox1.Location = new System.Drawing.Point(67, 72);
            this.comboBox1.Size = new System.Drawing.Size(156, 20);
            
            this.btnShowMessage.Location = new System.Drawing.Point(67, 110);
            this.btnShowMessage.Size = new System.Drawing.Size(75, 23);
            this.btnShowMessage.Text = "ShowMessage";
            this.btnShowMessage.Click += new EventHandler(ShowMessage_Click);
            
            this.Controls.Add(this.btnShowMessage);
            this.Controls.Add(this.comboBox1);
        }

        private void ShowMessage_Click(object sender, EventArgs e)
        {
            // 将选定项转化为对应的类型然后再取你需要的值
            DataRowView fDataRowView = (DataRowView)this.comboBox1.SelectedItem;

            string fEmployeeKey = fDataRowView["EmployeeKey"].ToString();
            string fName = fDataRowView["Name"].ToString();
            string fModifyDate = fDataRowView["ModifyDate"].ToString();

            MessageBox.Show(fEmployeeKey);
            MessageBox.Show(fName);
            MessageBox.Show(fModifyDate);
        }
    }
}

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