Windows 窗体应用程序启动时按钮为空白

Question

当我第一次打开我的 Windows 窗体应用程序时，一些按钮无法正确呈现，当窗体稍微移动时它们会出现。

见下文。

拖动它们出现的表单后。

这是我的启动代码。

[STAThread]
static void Main()
{
    bool createdNew = true;

    using (Mutex mutex = new Mutex(true, "Support_Desk_System", out createdNew))
    {
        if (createdNew)
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Form1());
            GC.KeepAlive(mutex);
        }
        else
        {
            Process current = Process.GetCurrentProcess();

            foreach (Process process in Process.GetProcessesByName(current.ProcessName))
            {
                if (process.Id != current.Id)
                {
                    SetForegroundWindow(process.MainWindowHandle);
                    break;
                }
            }
        }
    }
}

这不是一个大问题，只是烦人，因为我不知道为什么会这样。

这是表单代码。

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        this.status_CodesTableAdapter.Fill(this.supportDeskDataSet.Status_Codes);
        this.systemsTableAdapter.Fill(this.supportDeskDataSet.Systems);
        this.cases_Quick_ViewTableAdapter.Fill(this.supportDeskDataSet.Cases_Quick_View);
        this.dataGridView1.DoubleBuffered(true);
    }

    private void dataGridView1_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
    {
        foreach (DataGridViewRow Myrow in dataGridView1.Rows)
        {    
            if (Myrow.Cells[7].Value.ToString() == "High")
            {
                Myrow.DefaultCellStyle.BackColor = Color.Red;
            }
            else
            {
                Myrow.DefaultCellStyle.BackColor = Color.Green;
            }
            if(Myrow.Cells[2].Value.ToString() == "Back Burner")
            {
                Myrow.DefaultCellStyle.BackColor = Color.Gray;
                Myrow.DefaultCellStyle.ForeColor = Color.White;
            }
        }
    }
}
public static class DataGridViewExtensioncs
{
    public static void DoubleBuffered(this DataGridView dgv, bool setting)
    {
        var dgvType = dgv.GetType();
        var pi = dgvType.GetProperty("DoubleBuffered",
        BindingFlags.Instance | BindingFlags.NonPublic);
        pi.SetValue(dgv, setting, null);
    }
}

Answer 1

似乎在dataGridView1_CellFormatting中做的太多会导致问题。

我将代码缩小到：

private void dataGridView1_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
{
    foreach (DataGridViewRow Myrow in dataGridView1.Rows)
    {    
        if (Myrow.Cells[7].Value.ToString() == "High")
        {
            Myrow.DefaultCellStyle.BackColor = Color.Red;
        }
        //else
        //{
        //  Myrow.DefaultCellStyle.BackColor = Color.Green;
        //}
        if(Myrow.Cells[2].Value.ToString() == "Back Burner")
        {
            Myrow.DefaultCellStyle.BackColor = Color.Gray;
            Myrow.DefaultCellStyle.ForeColor = Color.White;
        }
    }
}

并将默认行颜色设置为绿色，现在它可以正常工作了。