在c# 自定义控件TextBox里，如何在DELETE之后光标停在删除位置（我遇到的问题是DELETE之后光标自动跳到末尾去了）？

Question

在c# 自定义控件TextBox里，如何在DELETE之后光标停在删除位置（我遇到的问题是DELETE之后光标自动跳到末尾去了）？
跪求高人解决！
谢谢！

Answer 1

namespace MoneyText
{
    public partial class MoneyTextBox : TextBox
    {
        public MoneyTextBox()
        {
            InitializeComponent();
        }        private int _maxByteLength = 32767;        private Boolean _checkMinusDataEnable = true;        private Color _minusDataColor = Color.Red;        private Boolean _changeForeColorEnable = true;        private Color _customForeColor = Color.Red;        private Boolean _changeBackColorEnable = false;        private Color _customBackColor = Color.FromArgb(255, 255, 128);        public Color MinusDataColor
        {
            get
            {
                return _minusDataColor;
            }
            set
            {
                _minusDataColor = value;
            }
        }        public Boolean CheckMinusDataEnable
        {
            set
            {
                _checkMinusDataEnable = value;
            }
        }
        public int MaxByteLength
        {
            get
            {
                return _maxByteLength;
            }
            set
            {
                _maxByteLength = value;
            }
        }        public Boolean ChangeBackColorEnable
        {
            set
            {
                _changeBackColorEnable = value;
            }
        }        public Color CustomForeColor
        {
            get
            {
                return _customForeColor;
            }
            set
            {
                _customForeColor = value;
            }
        }
        public Color CustomBackColor
        {
            get
            {
                return _customBackColor;
            }
            set
            {
                _customBackColor = value;
            }
        }
        public Boolean ChangeForeColorEnable
        {
            set
            {
                _changeForeColorEnable = value;
            }
        }

Answer 2

在删除的事件里：控件.Focus()

Answer 3

LZ贴这么大段属性代码上来我猜测是你在KeyDown时判断Del键按下，然后重新设置了TextBox的Text属性，这个时候你需要通过SelectionStart属性来设置光标的位置

Answer 4

主要是这样的问题：在这个自定义的TextBox控件里，当输入半角的数字金额（在最前面可以带半角负号）时，每三位要自动用半角逗号隔开。这就造成一个问题：当用DELETE删除的光标位于逗号前面时，它就不能进行删除操作（而是跳到数据最末尾了）。这个问题让我很郁闷啊！希望各位大虾帮我解决一下。

Answer 5

很奇怪的现象，我遇到一个类似的问题，就是TxtBox中只输入数据，如果用全角输入1234，框中显示半角的4321，至今没解决，我想这两个问题的机制类似吧？

Answer 6

楼主你贴这些属性看不出来啊，你应该是在keypress或其他什么事件里修改的textbox的文本吧。
如果等用户输入完成后，在textchange事件加千位分隔。用户做修改删除都没问题，等操作完成后才处理。
贴你的事件处理代码看看吧。

Answer 7

  private string ToMoneyFormat(Decimal strMoneyTextBox)
        {
            return strMoneyTextBox.ToString("#,#");
        }        private void MoneyTextBox_TextChanged(object sender, EventArgs e)
        {
            this.SelectionStart = this.Text.Length;
            Check();
            string money = this.Text.ToString();            if (this.Text.Length > 1)
            {
                this.Text = ToMoneyFormat(Convert.ToDecimal(this.Text));
            }
            if (System.Text.Encoding.GetEncoding(54936).GetByteCount(money) > 32767)
            //if (Convert.ToDecimal(System.Text.Encoding.Unicode.GetCharCount(money)) > 32767)
            {
                this.Enabled = false;
            }
        }        private void MoneyTextBox_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (this.Text == "0")
            {
                this.Text = "";
            }            if (e.KeyChar > 31 && e.KeyChar != 45 && e.KeyChar < '0' || e.KeyChar > '9')
            {
                if (this.Text.Length == 0)
                {
                    this.ForeColor = Color.Black;
                    this.BackColor = Color.White;
                    this.Text = "0";
                }
                e.Handled = true;
            }
            else
            {
                this.ForeColor = CustomForeColor;
                this.BackColor = CustomBackColor;
            }
            if ((e.KeyChar == 45 && this.SelectionStart != 0))
            {
                e.Handled = true;
            }
        }        private void MoneyTextBox_KeyUp(object sender, KeyEventArgs e)
        {
            Check();
            if (this.Text.Length == 0)
            {
                this.Text = "0";
            }
        }        private void Check()
        {            this.ForeColor = CustomForeColor;
            this.BackColor = CustomBackColor;
            if (this.Text == "" || this.Text == "0")
            {
                this.ForeColor = Color.Black;
                this.BackColor = Color.White;
            }
            else
            {
                try
                {
                    if (this.Text.ToString().StartsWith(","))
                    {
                        this.Text = this.Text.Substring(1, this.Text.Length - 1);
                    }
                    if (this.Text != "-")
                    {
                        Convert.ToDecimal(this.Text);
                    }                }
                catch
                {
                    this.ForeColor = Color.Black;
                    this.BackColor = Color.White;
                    this.Text = "0";
                }
            }
        }        protected override void WndProc(ref Message m)
        {
            MaxLength = this._maxByteLength;
            const int mPaste = 0x0302;
            if (m.Msg == mPaste)
            {
                IDataObject iData = Clipboard.GetDataObject();         //取剪贴板对象
                if (iData.GetDataPresent(DataFormats.Text))            //判断是否是Text
                {
                    string text = (string)iData.GetData(DataFormats.Text);//取数据
                    char[] str = text.ToCharArray();
                    if (CheckByteLengthFlow(text))
                    {
                        int len = GetByteLength(text);                  //输入的字符的长度
                        int tlen = GetByteLength(this.Text);            //文本框原有文本的长度
                        int slen = GetByteLength(this.SelectedText);    //文本框选中文本的长度
                        char[] c = text.ToCharArray();
                        int g;
                        int f = 0;
                        int count = 0;
                        for (g = 0; g < c.Length; g++)
                        {
                            count += GetByteLength(c[g].ToString());
                            if (_maxByteLength < (tlen - slen + count))
                            { f = g; break; }
                        }
                        int j = this.Text.ToCharArray().Length;                        int k = this.SelectedText.ToCharArray().Length;
                        this.MaxLength = j + f - k;
                        //}
                    }
                }
            }
            base.WndProc(ref m);
        }        private bool CheckByteLengthFlow(string text)
        {
            int len = GetByteLength(text);                              //输入的字符的长度
            int tlen = GetByteLength(this.Text);                        //文本框原有文本的长度
            int slen = GetByteLength(this.SelectedText);                //文本框选中文本的长度
            return (MaxLength < len + tlen - slen);
        }        private int GetByteLength(string vtext)
        {
            return System.Text.Encoding.GetEncoding("shift_jis").GetByteCount(vtext);
        }

Answer 8

http://msdn.microsoft.com/zh-cn/developercenters