User-892215765 posted
Hi, I'm trying out an example from the MCAD trainingbook but I can't manage to get the click event from a composite control right. Adding the event to the button (line 38) seems to go fine, but the click function (line 41) won't run. Any idea what's
going wrong?
1 using System;
2 using System.Collections.Generic;
3 using System.ComponentModel;
4 using System.Text;
5 using System.Web;
6 using System.Web.UI;
7 using System.Web.UI.WebControls;
8
9 namespace compositecontrols
10 {
11 public class mathBox : WebControl
12 {
13 [DefaultValue("0")]
14
15 TextBox txtMath = new TextBox();
16 Button butSum = new Button();
17 Label lblResult = new Label();
18
19 protected override void CreateChildControls()
20 {
21
22 base.CreateChildControls();
23
24 txtMath.TextMode = TextBoxMode.MultiLine;
25 Controls.Add(txtMath);
26
27 Controls.Add(new LiteralControl("<br>"));
28
29
30 butSum.Text = "Sum";
31
32 Controls.Add(butSum);
33
34 Controls.Add(new LiteralControl(" Result: <b>"));
35 Controls.Add(lblResult);
36 Controls.Add(new LiteralControl("</b>"));
37
38 butSum.Click += new EventHandler(butSum_Click);
39 }
40
41 public void butSum_Click(object sender, EventArgs e)
42 {
43 Sum();
44 }
45
46 public string Text
47 {
48 get
49 {
50 EnsureChildControls();
51 return txtMath.Text;
52 }
53 set
54 {
55 EnsureChildControls();
56 txtMath.Text = value;
57 }
58 }
59
60 char[] strStep = { '\r' };
61
62 public string[] Values
63 {
64 get
65 {
66 EnsureChildControls();
67 return txtMath.Text.Split(strStep);
68 }
69 set
70 {
71 EnsureChildControls();
72 txtMath.Text = String.Join(" ", value);
73 }
74 }
75
76 public string Result
77 {
78 get
79 {
80 EnsureChildControls();
81 return lblResult.Text;
82 }
83 }
84
85 public void Sum()
86 {
87 EnsureChildControls();
88
89 if (txtMath.Text.Length != 0)
90 {
91 string[] arrNums;
92 arrNums = txtMath.Text.Split(strStep);
93 double dblSum = 0;
94
95 foreach (string strCount in arrNums)
96 {
97 try
98 {
99 dblSum += Convert.ToDouble(strCount);
100 }
101 catch
102 {
103 }
104 }
105
106 lblResult.Text = dblSum.ToString();
107 }
108 else
109 {
110 lblResult.Text = "0";
111 }
112 }
113
114 protected override void Render(HtmlTextWriter writer)
115 {
116 EnsureChildControls();
117 txtMath.Width = this.Width;
118 double dHeight = this.Height.Value - butSum.Height.Value;
119 txtMath.Height = Unit.Parse(dHeight.ToString());
120 base.Render(writer);
121 }
122 }
123 }
