C# winfrom comboBox

Posted 2023-05-16

我做了一个winfrom，里面有几个combobox绑定的是一个数据源，当运行的时候选一个combobox的时候其它的combobox的值也同时改变，这个怎么解决

参考技术A 首先在窗体加载中，将comboBox的Data Source属性赋值，给数据源然后再comboBox的SelectedIndexChanged事件中，写选择的事件这样也可以：cbo.DataSource=List<T>();cbo.DisplayMember="实体类属性值"; //显示的选项cbo.ValueMember="实体类属性值"; //与显示相对应的值，看不到取值方法：MessageBox.Show(cbo.SelectedValue.ToString());这样就可以获取到选中项，对应的值了 参考技术B 那就弄多个数据源。如果是后台的DataTable ，可以用copy ，这样也减少了与数据库的交互数据，反正都是一样的。 参考技术C SelectedIndexChanged或者SelectedValueChanged事件。

C# Winfrom GDI+ 自定义控件

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Globalization;
using System.Windows.Forms;

namespace KUN.CONTROL.LIB.UC

    public partial class KFillTime : UserControl
    
        #region 属性定义
        [Browsable(true)]
        [Description("字体"), Category("自定义属性")]
        private Font timeFont = new Font("微软雅黑", 10, FontStyle.Bold);
        public Font TimeFont
        
            get  return this.timeFont; 
            set  this.timeFont = value; 
        
        [Browsable(true)]
        [Description("时间字体颜色"), Category("自定义属性")]
        /// <summary>
        /// 外部申明画笔和画刷工具
        /// </summary>
        private Color fontColor = Color.LightCoral;
        public Color FontColor
        
            get  return this.fontColor; 
            set  this.fontColor = value; 
        
        [Browsable(true)]
        [Description("占用时间填充颜色"), Category("自定义属性")]
        private Color fillColor = Color.OldLace;
        public Color FillColor
        
            get  return this.fillColor; 
            set  this.fillColor = value; 
        
        [Browsable(true)]
        [Description("开始小时数"), Category("自定义属性")]
        private int beginHour = 8;
        public int BeginHour
        
            get  return beginHour; 
            set  beginHour = value; 
        
        [Browsable(true)]
        [Description("显示几个小时"), Category("自定义属性")]
        private int hourCount = 10;
        public int HourCount
        
            get  return hourCount; 
            set  hourCount = value; 
        

        /// <summary>
        /// 时间段字典表
        /// </summary>
        public Dictionary<DateTime, DateTime> TimeParts = new Dictionary<DateTime, DateTime>();
        /// <summary>
        /// 时间格式
        /// </summary>
        DateTimeFormatInfo DateFormat = new DateTimeFormatInfo();
        /// <summary>
        /// 边距
        /// </summary>
        private int PaddingLeft = 50;//左边距
        private int PaddingRight = 10;//右边距
        private int PaddingButtom = 25;   // 下边距
        #endregion

        public KFillTime()
        
            InitializeComponent();

            DateFormat.ShortTimePattern = "HH:mm:ss";
        

        private void KFillTime_Paint(object sender, PaintEventArgs e)
        
            InitXYData(beginHour + "", hourCount);
        

        private void InitXYData(string beginTime, int hourCount)
        
            Graphics gra = this.CreateGraphics();
            Pen p = new Pen(Color.SeaGreen, 1);
            Pen p1 = new Pen(Color.LightSeaGreen, 1);
            float onecolwidth = (this.Width - PaddingRight - PaddingLeft) / 60;//每分钟宽度
            float hourwidth = (this.Height - 2 * PaddingButtom) / hourCount;
            Brush fontBursh = new SolidBrush(fontColor);

            //纵坐标
            for (int i = 0; i <= 60; i++)
            
                if (i % 5 == 0)//分钟
                
                    gra.DrawString(i + "", timeFont, fontBursh, onecolwidth * i + PaddingLeft, this.Height - PaddingButtom + 5);
                    gra.DrawLine(p, PaddingLeft + i * onecolwidth, this.Height - PaddingButtom - 5, PaddingLeft + i * onecolwidth, this.Height - PaddingButtom + 5);
                    gra.DrawLine(p, PaddingLeft + i * onecolwidth, PaddingButtom, PaddingLeft + i * onecolwidth, this.Height - PaddingButtom);
                
                else gra.DrawLine(p1, PaddingLeft + i * onecolwidth, PaddingButtom, PaddingLeft + i * onecolwidth, this.Height - PaddingButtom);
            
            gra.DrawString(" 分钟", timeFont, fontBursh, onecolwidth * 60 + PaddingLeft + 12, this.Height - PaddingButtom + 5);
            gra.DrawLine(p, PaddingLeft, this.Height - PaddingButtom, this.Width - PaddingLeft, this.Height - PaddingButtom);

            // 画横坐标标尺
            for (int j = 0; j < hourCount + 1; j++)
            
                gra.DrawLine(p1, PaddingLeft, this.Height - PaddingButtom - j * hourwidth, onecolwidth * 60 + PaddingLeft, this.Height - PaddingButtom - j * hourwidth);
                if (j < hourCount) gra.DrawString(Convert.ToInt32(beginTime) + j + ":00", timeFont, fontBursh, 0, this.Height - PaddingButtom - j * hourwidth - hourwidth / 2);
            

            gra.DrawString("小时", timeFont, fontBursh, 0, this.Height - PaddingButtom - hourCount * hourwidth);
            //画横坐标线
            gra.DrawLine(p, PaddingLeft, PaddingButtom, PaddingLeft, this.Height - PaddingButtom);
        

        public void FillUsedTimes()
        
            this.Refresh();
            if (TimeParts == null || TimeParts.Count == 0) return;

            foreach (KeyValuePair<DateTime, DateTime> temppair in TimeParts)
            
                FillTimeColor(temppair.Key, temppair.Value);
            
        

        public void FillUsedTimes(Dictionary<DateTime, DateTime> usedTimeDict)
        
            this.Refresh();
            foreach (KeyValuePair<DateTime, DateTime> temppair in usedTimeDict)
            
                FillTimeColor(temppair.Key, temppair.Value);
            
        

        private void FillTimeColor(DateTime beginTime, DateTime endTime)
        
            try
            
                float oneminlwidth = (this.Width - PaddingRight - PaddingLeft) / 60;//每分钟宽度
                float onehourwidth = (this.Height - 2 * PaddingButtom) / this.hourCount;//没小时宽度
                Pen pen = new Pen(fillColor, 1); // 已占用时间段画笔
                Brush brush = new SolidBrush(fillColor);
                Graphics gra = this.CreateGraphics();
                //在同一小时内
                if (beginTime.Hour == endTime.Hour)
                
                    float startX = beginTime.Minute * oneminlwidth + PaddingLeft;
                    float startY = this.Height - PaddingButtom - (beginTime.Hour - Convert.ToInt32(beginHour) + 1) * onehourwidth;
                    RectangleF rect = new RectangleF(startX, startY, oneminlwidth * (endTime.Minute - beginTime.Minute), onehourwidth);
                    gra.DrawRectangle(pen, startX, startY, oneminlwidth * (endTime.Minute - beginTime.Minute), onehourwidth);
                    gra.FillRectangle(brush, rect);
                
                else
                
                    float startX1 = beginTime.Minute * oneminlwidth + PaddingLeft;
                    float startY1 = this.Height - PaddingButtom - (beginTime.Hour - Convert.ToInt32(beginHour) + 1) * onehourwidth;
                    RectangleF rect1 = new RectangleF(startX1, startY1, oneminlwidth * (60 - beginTime.Minute), onehourwidth);
                    gra.DrawRectangle(pen, startX1, startY1, oneminlwidth * (60 - beginTime.Minute), onehourwidth);
                    gra.FillRectangle(brush, rect1);

                    float startY2 = this.Height - PaddingButtom - (endTime.Hour - Convert.ToInt32(beginHour) + 1) * onehourwidth;
                    RectangleF rect2 = new RectangleF(PaddingLeft, startY2, oneminlwidth * endTime.Minute, onehourwidth);
                    gra.DrawRectangle(pen, PaddingLeft, startY2, oneminlwidth * endTime.Minute, onehourwidth);
                    gra.FillRectangle(brush, rect2);
                
            
            catch (Exception)  
        

    

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Windows.Forms;

namespace KUN.CONTROL

    public partial class KFillTimeForm : Form
    
        public KFillTimeForm()
        
            InitializeComponent();
        

        private void button1_Click(object sender, EventArgs e)
        
            NewMethod();
        

        private void NewMethod()
        
            try
            
                Dictionary<DateTime, DateTime> dic = new Dictionary<DateTime, DateTime>();
                dic.Add(Convert.ToDateTime("8:00"), Convert.ToDateTime("8:10"));
                dic.Add(Convert.ToDateTime("8:50"), Convert.ToDateTime("9:40"));
                dic.Add(Convert.ToDateTime("13:12"), Convert.ToDateTime("13:34"));
                this.kFillTime1.TimeParts = dic;
                this.kFillTime1.FillUsedTimes();
            
            catch  return; 
        

        private void button2_Click(object sender, EventArgs e)
        
            try
            
                Dictionary<DateTime, DateTime> dic = new Dictionary<DateTime, DateTime>();
                dic.Add(Convert.ToDateTime("9:00"), Convert.ToDateTime("9:10"));
                dic.Add(Convert.ToDateTime("10:15"), Convert.ToDateTime("10:40"));
                this.kFillTime1.TimeParts = dic;
                this.kFillTime1.FillUsedTimes();
            
            catch  return; 
        

        private void KFillTimeForm_Activated(object sender, EventArgs e)
        
           // this.button1.PerformClick();
        
    
　　

运行效果：