我是c＃的新手，我想知道如何计算textBox的总数以结束循环。因此，例如：如果有8个文本框，并且用户在8个中的5个中输入值，我想知道如何计算使用的5并结束循环，并在说明使用了多少个文本框后显示messageBox
//这是代码
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 GPA_Calculator
{
public partial class FormTitle : Form
{
public FormTitle()
{
InitializeComponent();
}
private void Calculatebtn_Click(object sender, EventArgs e)
{
// Declare variables
double grade = 0.0;
double total_grade = 0.0;
double pre_gpa = 0.0;
double gpa_result = 0.0;
int class_one_textBox = 0;
int class_two_textBox = 0;
int class_three_textBox = 0;
int class_four_textBox = 0;
int class_five_textBox = 0;
#region // Checks if all fields are empty
if ((textBox1.Text.Trim() == string.Empty) && (string.IsNullOrEmpty(comboBox1.SelectedText))
&& (textBox2.Text.Trim() == string.Empty) && (string.IsNullOrEmpty(comboBox2.SelectedText))
&& (textBox3.Text.Trim() == string.Empty) && (string.IsNullOrEmpty(comboBox3.SelectedText))
&& (textBox4.Text.Trim() == string.Empty) && (string.IsNullOrEmpty(comboBox4.SelectedText))
&& (textBox5.Text.Trim() == string.Empty) && (string.IsNullOrEmpty(comboBox5.SelectedText)))
{
MessageBox.Show("Empty Fields!"); // Display message to user if field is empty
}// end if
#endregion
**/*NEED A BETTER LOOP HERE*/**
for (double i = 0; i <= total_grade.ToString().Count(); i++)
{
#region // Class 1 Calculations
if ((comboBox1.SelectedIndex > -1) && (textBox1.Text.Trim() == string.Empty)
|| (comboBox1.SelectedIndex == -1) && (textBox1.Text.Trim() != string.Empty))
{
MessageBox.Show("Class 1 contains an empty field!");
}
else if ((comboBox1.SelectedIndex > -1) && (textBox1.Text.Trim() != string.Empty))
{
switch (comboBox1.SelectedItem.ToString())
{
case "A":
class_one_textBox = int.Parse(textBox1.Text);
grade = 4.00 * class_one_textBox;
break;
case "A-":
class_one_textBox = int.Parse(textBox1.Text);
grade = 3.67 * class_one_textBox;
break;
case "B+":
class_one_textBox = int.Parse(textBox1.Text);
grade = 3.33 * class_one_textBox;
break;
case "B":
class_one_textBox = int.Parse(textBox1.Text);
grade = 3.00 * class_one_textBox;
break;
case "B-":
class_one_textBox = int.Parse(textBox1.Text);
grade = 2.67 * class_one_textBox;
break;
case "C+":
class_one_textBox = int.Parse(textBox1.Text);
grade = 2.33 * class_one_textBox;
break;
case "C":
class_one_textBox = int.Parse(textBox1.Text);
grade = 2.00 * class_one_textBox;
break;
case "C-":
class_one_textBox = int.Parse(textBox1.Text);
grade = 1.67 * class_one_textBox;
break;
case "D":
class_one_textBox = int.Parse(textBox1.Text);
grade = 1.33 * class_one_textBox;
break;
case "F":
class_one_textBox = int.Parse(textBox1.Text);
grade = 1.00 * class_one_textBox;
break;
} // end switch
} // end if
#endregion
#region // Class 2 Calculations
if ((comboBox2.SelectedIndex > -1) && (textBox2.Text.Trim() == string.Empty)
|| (comboBox2.SelectedIndex == -1) && (textBox2.Text.Trim() != string.Empty))
{
MessageBox.Show("Class 2 contains an empty field!");
}
else if ((comboBox2.SelectedIndex > -1) && (textBox2.Text.Trim() != string.Empty))
{
switch (comboBox2.SelectedItem.ToString())
{
case "A":
class_two_textBox = int.Parse(textBox2.Text);
grade = 4.00 * class_two_textBox;
break;
case "A-":
class_two_textBox = int.Parse(textBox2.Text);
grade = 3.67 * class_two_textBox;
break;
case "B+":
class_two_textBox = int.Parse(textBox2.Text);
grade = 3.33 * class_two_textBox;
break;
case "B":
class_two_textBox = int.Parse(textBox2.Text);
grade = 3.00 * class_two_textBox;
break;
case "B-":
class_two_textBox = int.Parse(textBox2.Text);
grade = 2.67 * class_two_textBox;
break;
case "C+":
class_two_textBox = int.Parse(textBox2.Text);
grade = 2.33 * class_two_textBox;
break;
case "C":
class_two_textBox = int.Parse(textBox2.Text);
grade = 2.00 * class_two_textBox;
break;
case "C-":
class_two_textBox = int.Parse(textBox2.Text);
grade = 1.67 * class_two_textBox;
break;
case "D":
class_two_textBox = int.Parse(textBox2.Text);
grade = 1.33 * class_two_textBox;
break;
case "F":
class_two_textBox = int.Parse(textBox2.Text);
grade = 1.00 * class_two_textBox;
break;
} // end switch
} // end if
#endregion
#region // Class 3 Calculations
if ((comboBox3.SelectedIndex > -1) && (textBox3.Text.Trim() == string.Empty)
|| (comboBox3.SelectedIndex == -1) && (textBox3.Text.Trim() != string.Empty))
{
MessageBox.Show("Class 3 contains an empty field!");
}
else if ((comboBox3.SelectedIndex > -1) && (textBox3.Text.Trim() != string.Empty))
{
switch (comboBox3.SelectedItem.ToString())
{
case "A":
class_three_textBox = int.Parse(textBox3.Text);
grade = 4.00 * class_three_textBox;
break;
case "A-":
class_three_textBox = int.Parse(textBox3.Text);
grade = 3.67 * class_three_textBox;
break;
case "B+":
class_three_textBox = int.Parse(textBox3.Text);
grade = 3.33 * class_three_textBox;
break;
case "B":
class_three_textBox = int.Parse(textBox3.Text);
grade = 3.00 * class_three_textBox;
break;
case "B-":
class_three_textBox = int.Parse(textBox3.Text);
grade = 2.67 * class_three_textBox;
break;
case "C+":
class_three_textBox = int.Parse(textBox3.Text);
grade = 2.33 * class_three_textBox;
break;
case "C":
class_three_textBox = int.Parse(textBox3.Text);
grade = 2.00 * class_three_textBox;
break;
case "C-":
class_three_textBox = int.Parse(textBox3.Text);
grade = 1.67 * class_three_textBox;
break;
case "D":
class_three_textBox = int.Parse(textBox3.Text);
grade = 1.33 * class_three_textBox;
break;
case "F":
class_three_textBox = int.Parse(textBox3.Text);
grade = 1.00 * class_three_textBox;
break;
} // end switch
} // end else/if
#endregion
#region // Class 4 Calculations
if ((comboBox4.SelectedIndex > -1) && (textBox4.Text.Trim() == string.Empty)
|| (comboBox4.SelectedIndex == -1) && (textBox4.Text.Trim() != string.Empty))
{
MessageBox.Show("Class 4 contains an empty field!");
}
else if ((comboBox4.SelectedIndex > -1) && (textBox4.Text.Trim() != string.Empty))
{
switch (comboBox4.SelectedItem.ToString())
{
case "A":
class_four_textBox = int.Parse(textBox4.Text);
grade = 4.00 * class_four_textBox;
break;
case "A-":
class_four_textBox = int.Parse(textBox4.Text);
grade = 3.67 * class_four_textBox;
break;
case "B+":
class_four_textBox = int.Parse(textBox4.Text);
grade = 3.33 * class_four_textBox;
break;
case "B":
class_four_textBox = int.Parse(textBox4.Text);
grade = 3.00 * class_four_textBox;
break;
case "B-":
class_four_textBox = int.Parse(textBox4.Text);
grade = 2.67 * class_four_textBox;
break;
case "C+":
class_four_textBox = int.Parse(textBox4.Text);
grade = 2.33 * class_four_textBox;
break;
case "C":
class_four_textBox = int.Parse(textBox4.Text);
grade = 2.00 * class_four_textBox;
break;
case "C-":
class_four_textBox = int.Parse(textBox4.Text);
grade = 1.67 * class_four_textBox;
break;
case "D":
class_four_textBox = int.Parse(textBox4.Text);
grade = 1.33 * class_four_textBox;
break;
case "F":
class_four_textBox = int.Parse(textBox4.Text);
grade = 1.00 * class_four_textBox;
break;
} // end switch
} // end else if
#endregion
#region // Class 5 Calculations
if ((comboBox5.SelectedIndex > -1) && (textBox5.Text.Trim() == string.Empty)
|| (comboBox5.SelectedIndex == -1) && (textBox5.Text.Trim() != string.Empty))
{
MessageBox.Show("Class 5 contains an empty field!");
}
else if ((comboBox5.SelectedIndex > -1) && (textBox5.Text.Trim() != string.Empty))
{
switch (comboBox5.SelectedItem.ToString())
{
case "A":
class_five_textBox = int.Parse(textBox5.Text);
grade = 4.00 * class_five_textBox;
break;
case "A-":
class_five_textBox = int.Parse(textBox5.Text);
grade = 3.67 * class_five_textBox;
break;
case "B+":
class_five_textBox = int.Parse(textBox5.Text);
grade = 3.33 * class_five_textBox;
break;
case "B":
class_five_textBox = int.Parse(textBox5.Text);
grade = 3.00 * class_five_textBox;
break;
case "B-":
class_five_textBox = int.Parse(textBox5.Text);
grade = 2.67 * class_five_textBox;
break;
case "C+":
class_five_textBox = int.Parse(textBox5.Text);
grade = 2.33 * class_five_textBox;
break;
case "C":
class_five_textBox = int.Parse(textBox5.Text);
grade = 2.00 * class_five_textBox;
break;
case "C-":
class_five_textBox = int.Parse(textBox5.Text);
grade = 1.67 * class_five_textBox;
break;
case "D":
class_five_textBox = int.Parse(textBox5.Text);
grade = 1.33 * class_five_textBox;
break;
case "F":
class_five_textBox = int.Parse(textBox5.Text);
grade = 1.00 * class_five_textBox;
break;
} // end switch
} // end else if
#endregion
total_grade = total_grade + grade;
}
// Sums up the amount of credits
pre_gpa = class_one_textBox + class_two_textBox + class_three_textBox
+ class_four_textBox + class_five_textBox;
gpa_result = total_grade / pre_gpa;
MessageBox.Show("Your GPA is " + gpa_result); // Displays GPA
答案 0 :(得分：2)
您可以使用扩展方法获取表单中的文本框。
public static IEnumerable<TControl> GetChildControls(this Control control) where TControl : Control
{
var children = (control.Controls != null) ? control.Controls.OfType<TControl>() : Enumerable.Empty<TControl>();
return children.SelectMany(c => GetChildControls(c)).Concat(children);
}
获取所有文本框。
var allTextBoxes = this.GetChildControls<TextBox>();
检查每个文本框中的值。
int sum = 0;
foreach (TextBox oTextBox in this.GetChildControls<TextBox>())
{
if(oTextBox.Text != string.Empty)
sum += 1;
}
答案 1 :(得分：1)
你应该使用this.Controls
int sum = 0;
foreach (TextBox tb in this.Controls.OfType<TextBox>())
{
if(tb.Text != string.Empty) //textbox is not empty do something
sum += int.Parse(tb.Text);
else break; // here you can detect if textbox is empty
}
您可以在Form的Load事件中使用此代码。上面的示例判断非空文本框的总和并打破第一个空文本框上的循环。你可以修改它不是为了打破循环而只是不计算空的文本框。
要以递归方式查找TextBox，请检查this link
答案 2 :(得分：1)
int count = 0; // create counter
foreach (Control c in Controls) // start loop through all the controls in the current form
{
if(!(c is TextBox)) continue; // if the control is not a TextBox, continue the loop
TextBox t = c as TextBox; // redeclare
if(t.Text != "") // if the text in the textbox is NOT empty
{
count++; // add to the counter
}
} // end loop
if (count >= 5) // check if the counter is higher or equal than 5
{
// do stuff!
}
我希望这会帮助你。我还没有自己运行它，但它应该工作。 （我希望！）
答案 3 :(得分：0)
您可以使用
int cnt = 0;
foreach (Control c in this.Controls)
if (c is System.Windows.Forms.TextBox)
if (!string.IsNullOrEmpty(c.Text))
cnt++;