c# – 尝试从文本框中获取int时出错
发布时间：2020-12-16 00:23:36 所属栏目：百科 来源：网络整理
导读：我是C#的新手和一般的编程.我能够在Console中创建所需的程序,但也想让一个人使用Forms.我试图从文本框中获取int时遇到问题. 在调试时我收到错误： Error 3 ‘int’ does not contain a definition for ‘Text’ and no extension method ‘Text’ accepting
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我是C#的新手和一般的编程.我能够在Console中创建所需的程序,但也想让一个人使用Forms.我试图从文本框中获取int时遇到问题.
在调试时我收到错误：
这是我到目前为止编写的代码. 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 Paint_Determinator_Form
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender,EventArgs e)
{
int LengthtextBox;
int WidthtextBox;
int HeighttextBox;
int paint;
int answer;
LengthtextBox = int.Parse(LengthtextBox.Text);
WidthtextBox = int.Parse(WidthtextBox.Text);
HeighttextBox = int.Parse(HeighttextBox.Text);
paint = 350;
answer = (LengthtextBox * WidthtextBox * HeighttextBox) / paint;
MessageBox.Show( answer.ToString() );
}
}
}
namespace Paint_Determinator_Form
{
partial class Form1
{
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.IContainer components = null;
/// <summary>
/// Clean up any resources being used.
/// </summary>
/// <param name="disposing">true if managed resources should be disposed; otherwise,false.</param>
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.label1 = new System.Windows.Forms.Label();
this.label2 = new System.Windows.Forms.Label();
this.label3 = new System.Windows.Forms.Label();
this.label4 = new System.Windows.Forms.Label();
this.WidthtextBox = new System.Windows.Forms.TextBox();
this.HeighttextBox = new System.Windows.Forms.TextBox();
this.LengthtextBox = new System.Windows.Forms.TextBox();
this.button1 = new System.Windows.Forms.Button();
this.SuspendLayout();
//
// label1
//
this.label1.AutoSize = true;
this.label1.Location = new System.Drawing.Point(28,29);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(454,13);
this.label1.TabIndex = 0;
this.label1.Text = "Welcome to Paint Determinator! Please enter the measurements in the appropriate f" +
"ields below!";
//
// label2
//
this.label2.AutoSize = true;
this.label2.Location = new System.Drawing.Point(28,91);
this.label2.Name = "label2";
this.label2.Size = new System.Drawing.Size(35,13);
this.label2.TabIndex = 1;
this.label2.Text = "Width";
//
// label3
//
this.label3.AutoSize = true;
this.label3.Location = new System.Drawing.Point(28,139);
this.label3.Name = "label3";
this.label3.Size = new System.Drawing.Size(38,13);
this.label3.TabIndex = 2;
this.label3.Text = "Height";
//
// label4
//
this.label4.AutoSize = true;
this.label4.Location = new System.Drawing.Point(28,183);
this.label4.Name = "label4";
this.label4.Size = new System.Drawing.Size(40,13);
this.label4.TabIndex = 3;
this.label4.Text = "Length";
//
// WidthtextBox
//
this.WidthtextBox.Location = new System.Drawing.Point(175,83);
this.WidthtextBox.Name = "WidthtextBox";
this.WidthtextBox.Size = new System.Drawing.Size(100,20);
this.WidthtextBox.TabIndex = 5;
//
// HeighttextBox
//
this.HeighttextBox.Location = new System.Drawing.Point(175,131);
this.HeighttextBox.Name = "HeighttextBox";
this.HeighttextBox.Size = new System.Drawing.Size(100,20);
this.HeighttextBox.TabIndex = 6;
//
// LengthtextBox
//
this.LengthtextBox.Location = new System.Drawing.Point(175,183);
this.LengthtextBox.Name = "LengthtextBox";
this.LengthtextBox.Size = new System.Drawing.Size(100,20);
this.LengthtextBox.TabIndex = 7;
//
// button1
//
this.button1.Location = new System.Drawing.Point(349,402);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(75,23);
this.button1.TabIndex = 9;
this.button1.Text = "Paint";
this.button1.UseVisualStyleBackColor = true;
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F,13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(511,447);
this.Controls.Add(this.button1);
this.Controls.Add(this.LengthtextBox);
this.Controls.Add(this.HeighttextBox);
this.Controls.Add(this.WidthtextBox);
this.Controls.Add(this.label4);
this.Controls.Add(this.label3);
this.Controls.Add(this.label2);
this.Controls.Add(this.label1);
this.Name = "Form1";
this.Text = "Form1";
this.ResumeLayout(false);
this.PerformLayout();
}
#endregion
private System.Windows.Forms.Label label1;
private System.Windows.Forms.Label label2;
private System.Windows.Forms.Label label3;
private System.Windows.Forms.Label label4;
private System.Windows.Forms.TextBox WidthtextBox;
private System.Windows.Forms.TextBox HeighttextBox;
private System.Windows.Forms.TextBox LengthtextBox;
private System.Windows.Forms.Button button1;
}
解决方法
为什么要像你的文本框一样命名你的注册？这确实是一种不好的做法,并且在极端情况下令人困惑.如您所见,编译器认为您使用的是int变量而不是文本框,并且抱怨int类型没有名为Text的属性.
因此,只需在click方法中更改int的名称即可 private void button1_Click(object sender,EventArgs e)
{
int l;
int w;
int h;
int paint;
int answer;
l = int.Parse(LengthtextBox.Text);
w = int.Parse(WidthtextBox.Text);
h = int.Parse(HeighttextBox.Text);
paint = 350;
answer = (l * w * h) / paint;
MessageBox.Show( answer.ToString() );
}
说,我建议使用Int32.TryParse将用户输入的数据转换为有效整数.如果您的用户键入无法转换为整数的内容,Parse方法将抛出异常,而TryParse返回false而没有代价高昂的异常 例如 int l;
if(!Int32.TryParse(LengthtextBox.Text,out l))
{
MessageBox.Show("Please type a valid number for Length");
return;
}
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