[英]Can't figure out what's wrong with my insert into statement to insert data from a windows forms textbox to a row in ms access database
[英]Can't figure what's wrong with my code
首先,对不起我的英语,这不是我的母语。 我正在读高中一年级,在我的大学里,我们有一个为期三年的系统分析和开发证书课程以及普通班。 我们只是在课程中开始学习c#,但是由于我们在实验室有一些空闲时间,因此我们开始使用winforms“玩”游戏。 我更喜欢看代码或Google错误而不是询问,但是这次我真的不知道出了什么问题。
当我只使用一种表单时,获取输入并实时显示所有用户的信息(没有组合框,仅显示标签),一切正常。 我想要做的是,输入五个用户,然后,如果正确填写了字段,则将用户的名字作为一项添加到组合框中,他可以看到以前浏览的用户的名字/性别/年龄组合框项目。
Form1的代码:
public partial class Form1 : Form
{
Form2 frm2 = new Form2();
public Form1()
{
InitializeComponent();
}
private void label9_Click(object sender, EventArgs e)
{
}
private void button1_Click(object sender, EventArgs e)
{
variaveis.i++;
variaveis.nome[variaveis.i] = textBox1.Text;
variaveis.sobrenome[variaveis.i] = textBox2.Text;
variaveis.sexo[variaveis.i] = comboBox1.Text;
if (textBox3.Text != null)
variaveis.idade[variaveis.i] = textBox3.Text;
double num;
bool isnum = double.TryParse(variaveis.idade[variaveis.i], out num);
Form2 frm2 = new Form2();
frm2.Update();
if (variaveis.nome[variaveis.i]!=null && variaveis.sobrenome!=null && variaveis.idade[variaveis.i] != null && isnum)
{
textBox1.Clear();
textBox2.Clear();
textBox3.Clear();
comboBox1.Refresh();
frm2.comboBox1.Items.Add(variaveis.nome[variaveis.i]); //Only works with the first input
if (variaveis.i == 1)
{
frm2.Show();
frm2.Location = new Point(this.Left + this.Width, this.Top);
frm2.Height = this.Height;
frm2.label6.Text = variaveis.nome[variaveis.i];
frm2.label7.Text = variaveis.sobrenome[variaveis.i];
frm2.label8.Text = variaveis.sexo[variaveis.i];
frm2.label9.Text = variaveis.idade[variaveis.i];
}
}
else
{
variaveis.i--;
MessageBox.Show("Preencha todos os campos",
"Erro");
}
if (variaveis.i >= 5)
{
button1.Enabled = false;
}
}
private void button2_Click(object sender, EventArgs e)
{
textBox1.Clear();
textBox2.Clear();
textBox3.Clear();
comboBox1.Refresh();
}
}
Form2的代码:
private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
label6.Text = variaveis.nome[comboBox1.SelectedIndex + 1]; // i don't even know if i can use an array like this
label7.Text = variaveis.sobrenome[comboBox1.SelectedIndex + 1];
label8.Text =variaveis.sexo[comboBox1.SelectedIndex + 1];
label9.Text = variaveis.idade[comboBox1.SelectedIndex + 1];
}
变量类(我认为如果我使用多种形式,如果我错了,请更正我,这样会更容易工作):
class variaveis
{
public static string[] nome = new string[5]; //name
public static string[] sobrenome = new string[5]; //last name
public static string[] sexo = new string[5]; //gender
public static string[] idade = new string[5]; //age(string, checked with tryparse)
public static int i = 0;
}
很抱歉,如果这是一个菜鸟问题,或者错误很明显,但是几周前我就开始使用WinForms。
编辑:所以现在的问题是:-有时即使所有条件都得到满足,程序也会向我抛出错误。
-不能以其他形式将项目添加到组合框。 试过这个:
public void AddItem(object item)
{
comboBox1.Items.Add(variaveis.nome[variaveis.i]);
}
在Form1中调用它:
frm2.AddItem(variaveis.nome[variaveis.i]);
语法似乎正确,但是没有任何反应。
如果您这样进行设置,我认为处理您的数据会更容易。
public class Person
{
public string Nome {get; set;}
public string Sobrenome {get; set;}
public string Sexo {get; set;}
public string Idade {get; set;}
}
public class Variaveis
{
public Person[] People {get; set;}
public Variaveis
{
People = new Person[5];
}
}
现在您可以像这样访问数据:
var myName = Variaveis.People[2].Nome;
我编辑了一些内容并解决了“如果”问题。 新代码:
public partial class Form1 : Form
{
public string[] nome = new string[5];
public string[] sobrenome = new string[5];
public string[] sexo = new string[5];
public string[] idade = new string[5];
public int i = 1;
public Form1()
{
InitializeComponent();
}
private void label9_Click(object sender, EventArgs e)
{
}
public void button1_Click(object sender, EventArgs e)
{
Form2 frm2 = new Form2(this);
nome[i] = textBox1.Text;
sobrenome[i] = textBox2.Text;
sexo[i] = comboBox1.Text;
idade[i] = textBox3.Text;
double num;
bool isnum = double.TryParse(idade[i], out num);
if (textBox1.Text !=null && textBox2.Text!=null && textBox3 != null && isnum == true)
{
frm2.comboBox1.Items.Add(textBox1.Text);
frm2.comboBox1.Update();
comboBox1.Update();
textBox4.Text = Convert.ToString(i); // just to check the variable's value, since they dont appear in the debugger tool
if (i == 1)
{
frm2.Show();
frm2.Location = new Point(this.Left + this.Width, this.Top);
frm2.Height = this.Height;
}
frm2.label6.Text = nome[i];
frm2.label7.Text = sobrenome[i];
frm2.label8.Text = sexo[i];
frm2.label9.Text = idade[i];
frm2.comboBox1.SelectedIndex = frm2.comboBox1.SelectedIndex + 1;
textBox1.Clear();
textBox2.Clear();
textBox3.Clear();
++i;
}
if(isnum == false && textBox1.Text == null && textBox2.Text == null && textBox3 == null)
{
MessageBox.Show("Preencha todos os campos", "Erro");
}
if (i >= 5)
{
button1.Enabled = false;
}
}
private void button2_Click(object sender, EventArgs e)
{
textBox1.Clear();
textBox2.Clear();
textBox3.Clear();
comboBox1.Refresh();
}
private void Form1_Load(object sender, EventArgs e)
{
}
我注意到,所有控件(不仅是combobox1)仅响应来自另一种形式的第一个命令。 如果我在form2中放置一个文本框并调用:
frm2.textBox1.Text = i;
它将永远显示“ 1”。 我该如何解决?
通过添加以下内容,自己解决了这个问题:
public partial class Form2 : Form
{
Form1 f1;
public Form2(Form1 f1)
{
InitializeComponent();
this.f1 = f1;
这个:
public partial class Form1 : Form
{
private Form2 frm2;
和这个:
public Form1()
{
InitializeComponent();
frm2 = new Form2(this);
}
带有一些改进的完整代码:
表格1:
public partial class Form1 : Form
{
private Form2 frm2;
public string[] nome = new string[6];
public string[] sobrenome = new string[6];
public string[] sexo = new string[6];
public string[] idade = new string[6];
public int i = 0;
public Form1()
{
InitializeComponent();
frm2 = new Form2(this);
}
public void button1_Click(object sender, EventArgs e)
{
++i;
nome[i] = textBox1.Text;
sobrenome[i] = textBox2.Text;
sexo[i] = comboBox1.Text;
idade[i] = textBox3.Text;
double num;
bool isnum = double.TryParse(idade[i], out num);
if (textBox1.Text !=null && textBox2.Text!=null && textBox3 != null && isnum == true)
{
frm2.comboBox1.Items.Add(textBox1.Text);
frm2.comboBox1.Update();
comboBox1.Update();
if (i == 1)
{
frm2.Show();
frm2.Location = new Point(this.Left + this.Width, this.Top);
frm2.Height = this.Height;
}
frm2.label6.Text = nome[i] + " " + sobrenome[i];
frm2.label8.Text = sexo[i];
frm2.label9.Text = idade[i];
frm2.comboBox1.SelectedIndex = frm2.comboBox1.SelectedIndex + 1;
textBox1.Clear();
textBox2.Clear();
textBox3.Clear();
}
if(isnum == false && textBox1.Text == null && textBox2.Text == null && textBox3 == null)
{
MessageBox.Show("Preencha todos os campos", "Erro");
--i;
}
if (i >= 5)
{
button1.Enabled = false;
}
}
private void button2_Click(object sender, EventArgs e)
{
textBox1.Clear();
textBox2.Clear();
textBox3.Clear();
comboBox1.Refresh();
}
private void Form1_Load(object sender, EventArgs e)
{
}
}
表格2:
public partial class Form2 : Form
{
Form1 f1;
public Form2(Form1 f1)
{
InitializeComponent();
this.f1 = f1;
comboBox1.Items.Add("Usuários");
}
private void Form2_Load(object sender, EventArgs e)
{
}
public void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
if (comboBox1.SelectedIndex != 0)
{
label6.Text = f1.nome[comboBox1.SelectedIndex] + " " + f1.sobrenome[comboBox1.SelectedIndex];
label8.Text = f1.sexo[comboBox1.SelectedIndex];
label9.Text = f1.idade[comboBox1.SelectedIndex];
}
else
{
label6.Text = " ";
label8.Text = " ";
label9.Text = " ";
}
}
}
无论如何,谢谢您的帮助。
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