标签在 Visual Studio 2010 上不起作用

Question

我正在使用 Visual Studio 2010 Ultimate，我尝试使用进度条和两个标签转换一些图像，但两个标签的文本都没有显示，程序只显示白色背景的标签。

附言标签背景颜色为“Control”（不透明）

我有两种形式，一种是“主”形式，一种是“ProgressDialog”形式

当我点击“保存”按钮时在主窗体中

//copy the filenames to a new array to sort them
string[] FileNames = openDialog.FileNames;
Array.Sort(FileNames);                

//create an instance of my progress dialog
ProgressDialog progress = new ProgressDialog(this, 100/FileNames.Length);
progress.ShowProgress();

//save all the files in the array
for (int i = 0; i < FileNames.Length; i++)
{    
    //call the SaveImage method 
    SaveImage(FileNames[i], 597, 412, Fill);

    //increase the progresbar and set the label text of the progress dialog to the filename
    progress.Increase(FileNames[i]);
}

progress.Close();//close progress dialog and re-enable the main form

...这里是我的“ProgressDialog”表单的代码：

Bar：进度条的名称

注释：图片路径为文本的标签名称

private Form SenderForm;// the "Main" form
private int Step; //value to increase in the progress bar

public ProgressDialog(Form sender, int step)//constructor
{
    InitializeComponent();

    SenderForm = sender;
    Step = step;
}

//disable cose button
private const int CP_NOCLOSE_BUTTON = 0x200;
protected override CreateParams CreateParams
{
    get
    {
        CreateParams myCp = base.CreateParams;
        myCp.ClassStyle = myCp.ClassStyle | CP_NOCLOSE_BUTTON;
        return myCp;
    }
}

//re-enable the "Main" form
private void ProgressDialog_FormClosed(object sender, FormClosedEventArgs e)
{
    SenderForm.Enabled = true;
    SenderForm.Activate();//activate form
} 

//increase the value of the progressbar
public void Increase( string comment=null, int step=0)
{
    //if step is 0 -> use the Step of the constructor
    if (step==0) step = Step;

    //if the comment (the current file name) is != of null
    if (comment!=null)
        Comment.Text = comment;//use the comment of the parameter

    //increase progressbar
    Bar.Value += step;            
}

//show "ProgrssDialog" form
public void ShowProgress()
{
    this.Show();
    SenderForm.Enabled = false;//disable the main form
}

Answer 1

这是因为主线程太忙而无法更新 ui 中的标签 您应该在线程中执行该过程以防止 UI 挂起 看看这个帖子C# question on preventing GUI from becoming sluggish when using backgroundworker/thread

Answer 2

我怀疑字体颜色也是白色的。尝试更改标签的颜色或背景颜色以查看是否显示文本。