輸入字符串格式不正確。我是C#的新手，我對Java有一些基本知識(shí)，但我無法正確地運(yùn)行這些代碼。這只是一個(gè)基本的計(jì)算器，但當(dāng)我運(yùn)行VS 2008程序時(shí)，會(huì)出現(xiàn)以下錯(cuò)誤：我做了幾乎相同的程序，但在java中使用JSwing，它工作得很好。以下是c#的形式：using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace calculadorac{
public partial class Form1 : Form
{
int a, b, c;
String resultado;
public Form1()
{
InitializeComponent();
a = Int32.Parse(textBox1.Text);
b = Int32.Parse(textBox2.Text);
}
private void button1_Click(object sender, EventArgs e)
{
add();
result();
}
private void button2_Click(object sender, EventArgs e)
{
substract();
result();
}
private void button3_Click(object sender, EventArgs e)
{
clear();
}
private void add()
{
c = a + b;
resultado = Convert.ToString(c);
}
private void substract()
{
c = a - b;
resultado = Convert.ToString(c);
}
private void result()
{
label1.Text = resultado;
}
private void clear()
{
label1.Text = "";
textBox1.Text = "";
textBox2.Text = "";
}}有什么問題嗎？有辦法解決嗎？PS：我也試過a = Convert.ToInt32(textBox1.text);b = Convert.ToInt32(textBox2.text);但沒起作用。
3 回答
千巷貓影
TA貢獻(xiàn)1829條經(jīng)驗(yàn) 獲得超7個(gè)贊
string measurements = string.empty;measurements += string.Format(@"
{{label: 'Measurement Name: {0}',
children: [
{{label: 'Measured Value: {1}'}},
{{label: 'Min: {2}'}},
{{label: 'Max: {3}'}},
{{label: 'Measured String: {4}'}},
{{label: 'Expected String: {5}'}},
]
}},",
drv["MeasurementName"] == null ? "NULL" : drv["MeasurementName"],
drv["MeasuredValue"] == null ? "NULL" : drv["MeasuredValue"],
drv["Min"] == null ? "NULL" : drv["Min"],
drv["Max"] == null ? "NULL" : drv["Max"],
drv["MeasuredString"] == null ? "NULL" : drv["MeasuredString"],
drv["ExpectedString"] == null ? "NULL" : drv["ExpectedString"]);
胡說叔叔
TA貢獻(xiàn)1804條經(jīng)驗(yàn) 獲得超8個(gè)贊
問題
因?yàn)?/trans> textBox1.Text只包含數(shù)字，但數(shù)字是 太大/太小 因?yàn)?/trans> textBox1.Text包含： (A)非數(shù)字(除外) space在開始/結(jié)束時(shí)， -(一開始)和/或 (B)您的代碼的應(yīng)用區(qū)域性中有1000個(gè)分隔符，而沒有指定 NumberStyles.AllowThousands或者您指定 NumberStyles.AllowThousands但錯(cuò)了 thousand separator在文化和/或 (C)十進(jìn)制分隔符(不應(yīng)存在于 int分析)
不確定的例子：
a = Int32.Parse("5000000000"); //5 billions, too largeb = Int32.Parse("-5000000000"); //-5 billions, too small//The limit for int (32-bit integer) is only from -2,147,483,648 to 2,147,483,647a = Int32.Parse("a189"); //having a a = Int32.Parse("1-89"); //having - but not in the beginninga = Int32.Parse("18 9"); //having space, but not in the beginning or endNumberStyles styles = NumberStyles.AllowThousands;a = Int32.Parse("1,189"); //not OK, no NumberStyles.AllowThousandsb = Int32.Parse("1,189", styles, new CultureInfo("fr-FR")); //not OK, having NumberStyles.AllowThousands but the culture specified use different thousand separatorNumberStyles styles = NumberStyles.AllowDecimalPoint;a = Int32.Parse("1.189", styles); //wrong, int parse cannot parse decimal point at all!似乎不確定，但實(shí)際上是好的例子：
a = Int32.Parse("-189"); //having - but in the beginningb = Int32.Parse(" 189 "); //having space, but in the beginning or endNumberStyles styles = NumberStyles.AllowThousands;a = Int32.Parse("1,189", styles); //ok, having NumberStyles.AllowThousands in the correct cultureb = Int32.Parse("1 189", styles, new CultureInfo("fr-FR")); //ok, having NumberStyles.AllowThousands and correct thousand separator is used for "fr-FR" culture解
textBox1.Textint
1234
使用 TryParse而不是 Parse若要確保非解析數(shù)字不會(huì)導(dǎo)致異常問題，請執(zhí)行以下操作。 檢查…的結(jié)果 TryParse如果不處理的話 trueint val;bool result = int.TryParse(textbox1.Text, out val);if (!result) return; //something has gone wrong//OK, continue using val
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