要求：只能输入数字和小数点，可以设置最大值，最小值，小数点前长度，小数点后长度（支持绑定设置）；
代码如下：
1 using System;
2 using System.Collections.Generic;
3 using System.Linq;
4 using System.Text;
5 using System.Threading.Tasks;
6 using System.Windows;
7 using System.Windows.Controls;
8 using System.Windows.Input;
9
10 namespace MyTool
11 {
12 /// <summary>
13 /// 数字输入框
14 /// author lixinmiao
15 /// </summary>
16 class NumTextBox : TextBox
17 {
18 public static readonly DependencyProperty NumTypeProperty = DependencyProperty.Register("NumType", typeof(Type), typeof(NumTextBox));
19 public static readonly DependencyProperty MaxValueProperty = DependencyProperty.Register("MaxValue", typeof(decimal), typeof(NumTextBox), new FrameworkPropertyMetadata(
20 new PropertyChangedCallback(CheckProperty)));
21
22 public static readonly DependencyProperty MinValueProperty = DependencyProperty.Register("MinValue", typeof(decimal), typeof(NumTextBox), new FrameworkPropertyMetadata(
23 new PropertyChangedCallback(CheckProperty)));
24 public static readonly DependencyProperty PointLenthProperty = DependencyProperty.Register("PointLenth", typeof(int), typeof(NumTextBox));
25 public static readonly DependencyProperty NumberLengthProperty = DependencyProperty.Register("NumberLength", typeof(int), typeof(NumTextBox));
26 // private System.Globalization.CultureInfo cI;
27 public NumTextBox()
28 {
29 MinValue = decimal.MinValue;
30 MaxValue = decimal.MaxValue;
31 PointLenth = 2;
32 NumberLength = 13;
33
34 }
35 public enum Type { Decimal, UDecimal, Int, UInt }
36 /// <summary>
37 /// 设置或获取textbox的输入数据类型
38 /// </summary>
39 public Type NumType
40 {
41 get { return (Type)GetValue(NumTypeProperty); }
42 set { SetValue(NumTypeProperty, value); }
43 }
44 /// <summary>
45 /// 设定或获取最大值
46 /// </summary>
47 public decimal MaxValue
48 {
49 get { return (decimal)GetValue(MaxValueProperty); }
50 set { SetValue(MaxValueProperty, value); }
51 }
52
53 /// <summary>
54 /// 设定或获取最小值
55 /// </summary>
56 public decimal MinValue
57 {
58 get { return (decimal)GetValue(MinValueProperty); }
59 set { SetValue(MinValueProperty, value); }
60 }
61 /// <summary>
62 /// 设置或获取小数点前的位数
63 /// </summary>
64 public int NumberLength
65 {
66 get { return (int)GetValue(NumberLengthProperty); }
67 set { SetValue(NumberLengthProperty, value); }
68 }
69 /// <summary>
70 /// 设置或获取小数点后位数长度
71 /// </summary>
72 public int PointLenth
73 {
74 get { return (int)GetValue(PointLenthProperty); }
75 set { SetValue(PointLenthProperty, value); }
76 }
77
78 private string val = "";
79 /// <summary>
80 /// 设定最大值最小值依赖属性回调函数
81 /// </summary>
82 /// <param name="d"></param>
83 /// <param name="e"></param>
84 private static void CheckProperty(DependencyObject d, DependencyPropertyChangedEventArgs e)
85 {
86 NumTextBox ntb = d as NumTextBox;
87 if (ntb.MaxValue < ntb.MinValue)
88 ntb.MaxValue = ntb.MinValue;
89 }
90 /// <summary>
91 /// 重写KeyDown事件，提供与事件有关的数据，过滤输入数据格式
92 /// </summary>
93 /// <param name="e"></param>
94 protected override void OnKeyDown(KeyEventArgs e)
95 {
96 string txt = this.Text;
97 int ind = this.CaretIndex;
98 if (txt.Contains("."))
99 {
100 // Console.WriteLine(txt.Split(‘.‘)[0] + "he " + txt.Split(‘.‘)[1]);
101 if (txt.Split(‘.‘)[1].Length >= PointLenth && ind > txt.Split(‘.‘)[0].Length && this.SelectionLength == 0)//控制小数点后输入位数
102 {
103 e.Handled = true;
104 return;
105 }
106 else if (txt.Split(‘.‘)[0].Length >= NumberLength && ind <= txt.Split(‘.‘)[0].Length)//控制小数点前输入位数（有小数点）
107 {
108 e.Handled = true;
109 return;
110 }
111 }
112 else if (txt.Length == NumberLength && e.Key != Key.Decimal && e.Key != Key.OemPeriod)//控制小数点前输入位数（无小数点）
113 {
114 e.Handled = true;
115 return;
116 }
117
118 if (e.Key == Key.Decimal || e.Key == Key.OemPeriod)
119 {
120 val = ".";
121 }
122 else
123 {
124
125 val = "";
126 }
127 switch (NumType)
128 {
129
130 case Type.UInt:
131 //屏蔽非法按键
132 if ((e.Key >= Key.NumPad0 && e.Key <= Key.NumPad9) || e.Key.ToString() == "Tab")
133 {
134 e.Handled = false;
135 }
136 else if (((e.Key >= Key.D0 && e.Key <= Key.D9)) && e.KeyboardDevice.Modifiers != ModifierKeys.Shift)
137 {
138 e.Handled = false;
139 }
140 else
141 {
142 e.Handled = true;
143 if (e.Key.ToString() != "RightCtrl")
144 { }
145 }
146 break;
147 case Type.Int:
148 //屏蔽非法按键
149 if ((e.Key >= Key.NumPad0 && e.Key <= Key.NumPad9) || e.Key == Key.Subtract || e.Key.ToString() == "Tab")
150 {
151 if ((txt.Contains("-") || this.CaretIndex != 0) && e.Key == Key.Subtract)
152 {
153 e.Handled = true;
154 return;
155 }
156 e.Handled = false;
157 }
158 else if (((e.Key >= Key.D0 && e.Key <= Key.D9) || e.Key == Key.OemMinus) && e.KeyboardDevice.Modifiers != ModifierKeys.Shift)
159 {
160 if ((txt.Contains("-") || this.CaretIndex != 0) && e.Key == Key.OemMinus)
161 {
162 e.Handled = true;
163 return;
164 }
165 e.Handled = false;
166 }
167 else
168 {
169 e.Handled = true;
170 if (e.Key.ToString() != "RightCtrl")
171 { }
172 }
173 break;
174 case Type.Decimal:
175 //屏蔽非法按键
176 if ((e.Key >= Key.NumPad0 && e.Key <= Key.NumPad9) || e.Key == Key.Decimal || e.Key == Key.Subtract || e.Key.ToString() == "Tab")
177 {
178 if (txt.Contains(".") && e.Key == Key.Decimal)
179 {
180 e.Handled = true;
181 return;
182 }
183 else if ((txt.Contains("-") || this.CaretIndex != 0) && e.Key == Key.Subtract)
184 {
185 e.Handled = true;
186 return;
187 }
188 e.Handled = false;
189 }
190 else if (((e.Key >= Key.D0 && e.Key <= Key.D9) || e.Key == Key.OemPeriod || e.Key == Key.OemMinus) && e.KeyboardDevice.Modifiers != ModifierKeys.Shift)
191 {
192 if (txt.Contains(".") && e.Key == Key.OemPeriod)
193 {
194 e.Handled = true;
195 return;
196 }
197 else if ((txt.Contains("-") || this.CaretIndex != 0) && e.Key == Key.OemMinus)
198 {
199 e.Handled = true;
200 return;
201 }
202 e.Handled = false;
203 }
204 else
205 {
206 e.Handled = true;
207 if (e.Key.ToString() != "RightCtrl")
208 { }
209 }
210 break;
211 case Type.UDecimal:
212 default:
213 //屏蔽非法按键
214 if ((e.Key >= Key.NumPad0 && e.Key <= Key.NumPad9) || e.Key == Key.Decimal || e.Key.ToString() == "Tab")
215 {
216 if (txt.Contains(".") && e.Key == Key.Decimal)
217 {
218 e.Handled = true;
219 return;
220 }
221 e.Handled = false;
222 }
223 else if (((e.Key >= Key.D0 && e.Key <= Key.D9) || e.Key == Key.OemPeriod) && e.KeyboardDevice.Modifiers != ModifierKeys.Shift)
224 {
225 if (txt.Contains(".") && e.Key == Key.OemPeriod)
226 {
227 e.Handled = true;
228 return;
229 }
230 e.Handled = false;
231 }
232 else
233 {
234 e.Handled = true;
235 if (e.Key.ToString() != "RightCtrl")
236 { }
237 }
238
239 break;
240 }
241 base.OnKeyDown(e);
242 }
243 /// <summary>
244 ///粘贴内容过滤，设定最大值、最小值，限制小数点输入长度
245 /// </summary>
246 /// <param name="e"></param>
247 protected override void OnTextChanged(TextChangedEventArgs e)
248 {
249 int t1 = this.Text.Length;
250 if (t1 != 0)//用于是否可以将文本空置空
251 {
252 decimal d = 0;
253 if (this.Text != "-" && this.Text != "." && this.Text != "-0" && this.Text != "-." && this.Text != "-0." && val != ".")
254 {
255 if (decimal.TryParse(this.Text, out d))
256 {
257 if (NumType == Type.Decimal || NumType == Type.UDecimal)
258 {
259 if (d.ToString().Split(‘.‘)[0].Length > NumberLength)//
260 {
261 d = 0;
262 }
263 else
264 {
265 d = Math.Round(d, PointLenth, MidpointRounding.AwayFromZero);
266 }
267 }
268 else
269 if (d.ToString().Split(‘.‘)[0].Length > NumberLength)//
270 {
271 d = 0;
272 }
273 else
274 {
275 d = Math.Round(d, 0, MidpointRounding.AwayFromZero);
276 }
277 }
278 int t2 = d.ToString().Length;
279 if (Math.Abs(t1 - d.ToString().Length) > 0)
280 {
281 this.Text = d.ToString();
282 this.CaretIndex = d.ToString().Length;
283 }
284 else
285 {
286 this.Text = d.ToString();
287 }
288
289 }
290 if ((NumType == Type.UDecimal || NumType == Type.UInt) && this.Text.Contains("-"))
291 {
292 this.Text = Math.Abs(d).ToString();
293 }
294 if ((NumType == Type.UInt || NumType == Type.Int) && this.Text.Contains("."))
295 {
296 this.Text = int.Parse(d.ToString()).ToString();
297 }
298 }
299 base.OnTextChanged(e);
300 }
301
302 /// <summary>
303 ///如果数据是0，得到光标，清空数据
304 /// </summary>
305 /// <param name="e"></param>
306 protected override void OnGotFocus(RoutedEventArgs e)
307 {
308 //InputMethod.SetPreferredImeState(this, InputMethodState.Off);
309 //cI = InputLanguageManager.GetInputLanguage(this);
310 //decimal d = 0;
311 //if (decimal.TryParse(this.Text, out d))
312 //{
313 if (this.Text == "0")
314 {
315 this.Text = "";
316 }
317 //}
318 //else
319 //{
320 // this.Text = "";
321 //}
322 base.OnGotFocus(e);
323 }
324
325 /// <summary>
326 ///失去光标，确定最大值最小值
327 /// </summary>
328 /// <param name="e"></param>
329 protected override void OnLostFocus(RoutedEventArgs e)
330 {
331 decimal d = 0;
332 if (decimal.TryParse(this.Text, out d))
333 {
334 if (d < MinValue)
335 {
336 d = MinValue;
337 this.Text = d.ToString();
338 }
339
340 else if (d > MaxValue)
341 {
342 d = MaxValue;
343 this.Text = d.ToString();
344 }
345 }
346 else if (string.IsNullOrEmpty(this.Text))
347 {
348 this.Text = "";
349 }
350 else
351 {
352 this.Text = d.ToString();
353 }
354 base.OnLostFocus(e);
355 //System.Globalization.CultureInfo cI = InputLanguageManager.GetInputLanguage(this);
356 //InputMethod.SetPreferredImeState(this, InputMethodState.DoNotCare);
357 //InputLanguageManager.SetInputLanguage(this, cI);
358 //cI = null;
359 }
360 }
361 }
具体用法：
将改文件命名控件引用到要使用的xaml页面，然后采用引用控件的使用方法使用即可。
通过NumType设置绑定的数据类型，整数，正整数，小数，正小数；
其余的几个属性类似；
欢迎探讨。
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时间： 2024-10-12 12:12:16