Question

我的情况是我有Form 1和Form2。在Form 1中，我有button1和button2。我在整个Form1中将bool dtgmb定义为false。但是，如果单击button2，则dtgmb为true。

在表格2中，我有1个DTG和button3，其中所有行的数据都已定义。因此，我运行一个实例，其中如果dtgmb为假（单击按钮1），则显示object[] rows的内容，如果dtgmb为真（单击按钮2），则显示的内容改为object[] rows1。然后，单击button3以返回到Form1。

但是，如果我先单击button1，然后返回到Form 1并单击button2，则Form2将同时显示object[] rows的显示内容。然后，如果我关闭该应用程序并再次重新启动，这一次我首先单击button2，然后返回到窗体1并单击button1，则Form2将两次显示object[] rows1的显示内容。

下面是我的代码：

表格1

public bool dtgmb = false;

private void button1_Click(object sender, EventArgs e)
{
    //Forms saved in class called FormsCollection
    FormsCollection.Form1.Hide();
    FormsCollection.Form2.Show();
}

private void button2_Click(object sender, EventArgs e)
{
    FormsCollection.Form1.Hide();
    dtgmb = true;
    FormsCollection.Form2.Show();
}

表格2

private void Form2_Load(object sender, EventArgs e)
 {
   stuff(FormsCollection.Form1);
 }   

public void stuff(Form1 form)
{
    DataGridViewCheckBoxColumn check = new DataGridViewCheckBoxColumn();
    DataGridViewCheckBoxColumn check1 = new DataGridViewCheckBoxColumn();
    dataGridView4.ColumnCount = 1;
    dataGridView4.Columns[0].Width = 380;
    dataGridView4.Columns[0].Name = "Item";
    string[] row1 = new string[] { "Tables" };
    string[] row2 = new string[] { "Chairs" };
    string[] row3 = new string[] { "Lamps" };
    string[] row4 = new string[] { "Pillows" };
    string[] row5 = new string[] { "Blankets" };
    object[] rows = new object[] { row1, row2, row3, row4, row5 };
    object[] rows1 = new object[] { row1, row2, row3, row4 };

    if (form.dtgmb == false)
        foreach (string[] rowArray in rows)
        {
            this.dataGridView4.Rows.Add(rowArray);
        }
    else
        foreach (string[] rowArray in rows1)
        {
            this.dataGridView4.Rows.Add(rowArray);
        }

    check.HeaderText = "Pass";
    check1.HeaderText = "Fail";
    dataGridView4.Columns.Add(check);
    dataGridView4.Columns.Add(check1);
}

Answer 1

该问题是由于dtgmb被标记为静态的。这意味着所有实例，无论它们的寿命如何，都将共享相同的值。静态变量在应用程序开始使用其本机默认值时初始化（例如，整数初始化为零，而布尔值初始化为false）。

如果删除static修饰符，则需要使用对表单的引用来调用stuff方法。由于您没有向我们展示您在哪里打电话的内容，因此我在此处发布您发布的内容的重构。

Form1.cs ：

public bool dtgmb = false;

private void button1_Click(object sender, EventArgs e)
{
    //Forms saved in class called FormsCollection
    FormsCollection.Form1.Hide();
    FormsCollection.Form2.Show();
}

private void button2_Click(object sender, EventArgs e)
{
    FormsCollection.Form1.Hide();
    dtgmb = true;
    FormsCollection.Form2.Show();
}

和 Form2.cs

public void stuff(Form1 form)
{
    DataGridViewCheckBoxColumn check = new DataGridViewCheckBoxColumn();
    DataGridViewCheckBoxColumn check1 = new DataGridViewCheckBoxColumn();
    dataGridView4.ColumnCount = 1;
    dataGridView4.Columns[0].Width = 380;
    dataGridView4.Columns[0].Name = "Item";
    string[] row1 = new string[] { "Tables" };
    string[] row2 = new string[] { "Chairs" };
    string[] row3 = new string[] { "Lamps" };
    string[] row4 = new string[] { "Pillows" };
    string[] row5 = new string[] { "Blankets" };
    object[] rows = new object[] { row1, row2, row3, row4, row5 };
    object[] rows1 = new object[] { row1, row2, row3, row4 };

    if (form.dtgmb == false)
        foreach (string[] rowArray in rows)
        {
            this.dataGridView4.Rows.Add(rowArray);
        }
    else
        foreach (string[] rowArray in rows1)
        {
            this.dataGridView4.Rows.Add(rowArray);
        }

    check.HeaderText = "Pass";
    check1.HeaderText = "Fail";
    dataGridView4.Columns.Add(check);
    dataGridView4.Columns.Add(check1);
}

请记住，直接共享字段不是一个好习惯，但这对于理解问题所在是很好的。

在评论后进行编辑

我不清楚您要达到什么目标。您尝试将类型作为函数的形式参数传递时，代码不起作用。我重构了您的代码以进行编译（但我不知道它的行为）：

Program.cs

    static void Main()
    {
        Application.EnableVisualStyles();
        Application.SetCompatibleTextRenderingDefault(false);
        new Form1().Show();
        Application.Run(new Form2());
    }

Form1.cs

public partial class Form1 : Form
{
    public bool dtgmb = false;

    public Form1()
    {
        InitializeComponent();

        FormCollection.Form1 = this;
    }


    private void button1_Click(object sender, EventArgs e)
    {
        //Forms saved in class called FormsCollection
        FormCollection.Form1.Hide();
        FormCollection.Form2.Show();
    }

    private void button2_Click(object sender, EventArgs e)
    {
        FormCollection.Form1.Hide();
        dtgmb = true;
        FormCollection.Form2.Show();
    }

    private void Form1_Click(object sender, EventArgs e)
    {
    }

    private void Form1_FormClosed(object sender, FormClosedEventArgs e)
    {
        FormCollection.Form1 = null;
    }
}

public static class FormCollection
{
    public static Form1 Form1;
    public static Form2 Form2;

}

Form2.cs

public partial class Form2 : Form
{
    public Form2()
    {
        InitializeComponent();

        FormCollection.Form2 = this;
    }

    private void Form2_Load(object sender, EventArgs e)
    {
        stuff(FormCollection.Form1);
    }

    public void stuff(Form1 form)
    {
        DataGridViewCheckBoxColumn check = new DataGridViewCheckBoxColumn();
        DataGridViewCheckBoxColumn check1 = new DataGridViewCheckBoxColumn();
        dataGridView4.ColumnCount = 1;
        dataGridView4.Columns[0].Width = 380;
        dataGridView4.Columns[0].Name = "Item";
        string[] row1 = new string[] { "Tables" };
        string[] row2 = new string[] { "Chairs" };
        string[] row3 = new string[] { "Lamps" };
        string[] row4 = new string[] { "Pillows" };
        string[] row5 = new string[] { "Blankets" };
        object[] rows = new object[] { row1, row2, row3, row4, row5 };
        object[] rows1 = new object[] { row1, row2, row3, row4 };

        if (form.dtgmb == false)
            foreach (string[] rowArray in rows)
            {
                this.dataGridView4.Rows.Add(rowArray);
            }
        else
            foreach (string[] rowArray in rows1)
            {
                this.dataGridView4.Rows.Add(rowArray);
            }

        check.HeaderText = "Pass";
        check1.HeaderText = "Fail";
        dataGridView4.Columns.Add(check);
        dataGridView4.Columns.Add(check1);
    }

    private void Form2_FormClosed(object sender, FormClosedEventArgs e)
    {
        FormCollection.Form2 = null;
    }
}

请注意，上面的代码有几个问题：一个问题全部取决于表单的初始化方式。

Winforms：布尔逻辑不能正常工作

1 个答案: