Convert.ToInt32(textBox2.Text.Trim() 报错

clleady 2015-11-27 09:47:35

textBox3.Text = Convert.ToString(Convert.ToInt32(textBox1.Text.Trim()) + Convert.ToInt32(textBox2.Text.Trim()));

textbox2输入1.6则

。{输入字符串的格式不正确。}

即输入小数则报错。输入整数相加则正确。

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Lear_ken 2015-11-28

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第一，你到底是要实现整数计算还是小数计算？要实现整数计算就在输入框控制不要输入小数，否则就改变整数转换函数为小数转换函数；第二，一般这种转换要么会在输入框限制可输入字符，要么使用数值的TryParse方式。

Poopaye 2015-11-27

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你要转整数就限制好textbox里不能输入0-9，负号以外的字符

clleady 2015-11-27

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该怎么修改？ textBox3.Text = Convert.ToString(Convert.ToInt32(textBox1.Text.Trim()) + Convert.ToInt32(1.6)); 直接将textBox2.Text.Trim替换为小数1.6则正常运行。

字符串的相加，检索，替换，截取，插入，计算长度 private void button1_Click(object sender, EventArgs e) { string a = textBox1.Text.ToString(); string b = textBox2.Text.ToString(); string c = a + b; textBox3.Text = c; } private void button2_Click(object sender, EventArgs e) { string a = textBox1.Text.ToString(); textBox3.Text = a.Length.ToString(); } private void button3_Click(object sender, EventArgs e) { string a = textBox1.Text.ToString(); string b = textBox2.Text.ToString(); textBox3.Text = b.Insert(0, a); } private void button4_Click(object sender, EventArgs e) { string a = textBox1.Text.ToString(); int b = Convert.ToInt16(textBox2.Text.Trim()); textBox3.Text = a.Remove(b); } private void button5_Click(object sender, EventArgs e) { string a = textBox1.Text.ToString(); string b = textBox2.Text.ToString(); string c = textBox3.Text.ToString(); textBox3.Text = a.Replace(b,c); } private void button6_Click(object sender, EventArgs e) { string a = textBox1.Text.ToString(); int b = Convert.ToInt16(textBox2.Text.Trim()); int c = Convert.ToInt16(textBox3.Text.Trim()); textBox3.Text = a.Substring(b, c); }

C#栈和队列的应用实例源码 private void button1_Click(object sender, EventArgs e) { if (textBox3.Text.Length > 0) { if (IsIDnum(textBox3.Text.Trim())) { int i = Convert.ToInt32(textBox3.Text.Trim()); b.Push(i); str = str + textBox3.Text.Trim() + ","; label4.Text = str; textBox3.Text = ""; } else { textBox3.Text = "必须为数字"; } } else { textBox3.Text = "不能为空"; } } private void button3_Click(object sender, EventArgs e) { if (b.Count == 0) { textBox4.Text = "栈为空"; label4.Text =""; } else { textBox4.Text = b.Pop().ToString(); int n = str.LastIndexOf(","); str = str.Substring(0, n); int m = str.LastIndexOf(","); str = str.Substring(0, m+1); label4.Text = str; } }

初级学软件之ASP.NET第三季 ASP.NET控件的使用视频课程主讲内容：第一讲文本类型控件-Label第二讲文件类型控件-TextBox第三讲按钮类型-Button第四讲按钮类型-LinkButton第五讲按钮类型-ImageButton第六讲按钮类型-HyperLink第七讲选择类型-ListBox

登录代码：protected void Button1_Click(object sender, EventArgs e) { SqlConnection myCon = new SqlConnection("Server=(local);Database=db_SingleuserLogin;User Id=sa;Password=111111"); myCon.Open(); SqlCommand myCom = new SqlCommand("select count(*) from tb_Login where UserID= '" + TextBox1.Text.Trim() + "' and UserPwd='" + TextBox2.Text.Trim() + "'", myCon); int i = Convert.ToInt32(myCom.ExecuteScalar()); if (i > 0) Response.Redirect("Main.aspx"); else Response.Write("<script language=javascript>alert('你是非法用户或密码错误！')TextBox1.Text = ""; TextBox2.Text = ""; }

tb_url.Text = tb_url.Text.Trim(); System.Net.HttpWebRequest request = (System.Net.HttpWebRequest)System.Net.WebRequest.Create( new Uri( tb_url.Text)); System.Net.HttpWebResponse response = (System.Net.HttpWebResponse)request.GetResponse(); System.IO.Stream responseStream = response.GetResponseStream(); System.IO.StreamReader sr = new System.IO.StreamReader(responseStream, Encoding.UTF8); string content_start = sr.ReadToEnd(); textBox1.Text = content_start; tb_time.Text =tb_time .Text .Trim(); lb_count.Text = tb_time.Text; timer1.Interval = Convert.ToInt16(tb_time.Text) * 1000; timer1.Enabled = true; timer1s.Enabled = true; listBox1.Items.Add(DateTime .Now .ToString ()+"监视开始！");

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