Private Void Button1 Click
![](/file/191140a743e9134750451.gif)
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ошибка возникает в строке
B = Convert.ToDouble(textBox2.Text);
System.FormatException: "Входная строка имела неверный формат."
private void button1_Click(object sender, EventArgs e)
{
double A, B, C, P, Pp, S;
A = Convert.ToDouble(textBox1.Text); //присваивание переменной
// А значения textBox1
B = Convert.ToDouble(textBox2.Text); //присваивание переменной
// B значения textBox2
C = Convert.ToDouble(textBox3.Text); //присваивание переменной
// C значения textBox3
P = A + B + C; //вычисление периметра
Pp = P / 2; //вычисление полупериметра
S = Math.Sqrt(Pp * (Pp - A) * (Pp - B) * (Pp - C));
//вычисление площади
textBox4.Text = Convert.ToString(P); //вывод значения периметра
// в textBox4
textBox5.Text = Convert.ToString(S); //вывод значения в площади
// textBox5
}
вот весь код
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace Проект_1_1_Лаб
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
double A, B, C, P, Pp, S;
A = Convert.ToDouble(textBox1.Text); //присваивание переменной
// А значения textBox1
B = Convert.ToDouble(textBox2.Text); //присваивание переменной
// B значения textBox2
C = Convert.ToDouble(textBox3.Text); //присваивание переменной
// C значения textBox3
P = A + B + C; //вычисление периметра
Pp = P / 2; //вычисление полупериметра
S = Math.Sqrt(Pp * (Pp - A) * (Pp - B) * (Pp - C));
//вычисление площади
textBox4.Text = Convert.ToString(P); //вывод значения периметра
// в textBox4
textBox5.Text = Convert.ToString(S); //вывод значения в площади
// textBox5
}
private void button2_Click(object sender, EventArgs e)
{
Close();
}
}
}
я не особо понимаю о чем вы
при вводе 3 сторон треугольника он должен высчитывать его площадь и периметр, но я не знаю в чем проблема... код так то правильный
Максим, 3 года назад
Искусственный Интеллект
Скорее всего ты используешь неправильный разделитель. Точка или запятая может использоваться в зависимо от текущей культуры.
Давай нормальные имена элементам управления. Это не textBox, а txtA.
Пиши число (в textbox) в правильном формате и не будет ошибки. Формат зависит от региональных параметров системы. Но можно указать и свой формат:
System.Globalization.NumberFormatInfo fmt = new System.Globalization.NumberFormatInfo();
fmt.NumberDecimalSeparator = ","; // десятичный разделитель
fmt.NumberGroupSeparator = "."; // разделитель тысяч
В = Convert.ToDouble(textBox2.Text, fmt);
Нажимая на кнопку, вы принимаете условия пользовательского соглашения
Мухомор . в «C/C++», 4 месяца назад
719 767 125 ответов на любой вопрос
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private void button1_Click(object sender, EventArgs e)
new System.Threading.Thread(delegate()
int rowcount = ((System.Data.DataTable)this.dgResult.DataSource).Rows.Count;
System.Data.DataTable dt = (System.Data.DataTable)this.dgResult.DataSource;
BeginInvoke(new MethodInvoker(delegate()
svDialog.Title = "Save an Excel File";
Business.ExportToExcel.ExcelFromDataTable(dt, svDialog.FileName);
MessageBox.Show("Export completed");
svDialog.Title = "Save an Excel File";
Business.ExportToExcel.ExcelFromDataTable(dt, svDialog.FileName);
MessageBox.Show("Export completed");
private void button1_Click(object sender, EventArgs e) {
System.Data.DataTable dt = (System.Data.DataTable)this.dgResult.DataSource;
DialogResult rslt = this.svDialog.ShowDialog(this);
string filePath = this.svDialog.FileName;
// QueueUserWorkItem runs target delegate in separate thread
ThreadPool.QueueUserWorkItem( (_state)=> this.Export(dt, filePath) );
private void Export(DataTable data, string filePath) {
try { Business.ExportToExcel.ExcelFromDataTable(dt, filePath); }
catch( Exception exc ) { thrownException = exc; }
if ( null == thrownException ) { MsgBox("Export completed."); }
else { MsgBox("Error: " + thrownException.Message); }
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