c# - C#-验证时突出显示错误的控件

Question

我试图用try catch验证Windows窗体，到目前为止，我成功了。我的目标是，当有人忘记填补空白或输入错误时，使用警告提示捕获返回消息框。现在，我还要验证的每个控件上都有Validating事件，因此当有人将其保留为空或格式不正确时，它将在控件旁边显示错误。到目前为止，这似乎还可以(至少对我而言)，但是我的问题是，如果用户甚至没有单击一个框，它只会显示消息框，但不会突出显示错误的控件。

下面是我的代码:

private void createButton_Click(object sender, EventArgs e)
    {
        try
        {
            Book newBook = new Book(titleBox.Text, authBox.Text, Convert.ToInt32(yearBox.Text), Convert.ToInt32(editBox.Text), pubComboBox.Text, descBox.Text);
            bookList.Add(newBook);
            booklistListBox.DataSource = bookList;
        }
        catch (FormatException)
        {
            MessageBox.Show("You probably missed a gap or put in incorrect form");
        }

    }

以及那些验证事件:

 private void titleBox_Validating(object sender, CancelEventArgs e)
    {
         if (titleBox.Text.Trim() == String.Empty)
        {
            errorProvider.SetError(titleBox, "Title is required");
            e.Cancel = true;
        }
         else
        {
            errorProvider.SetError(titleBox, "");
        }
    }

    private void authBox_Validating(object sender, CancelEventArgs e)
    {
        if (authBox.Text.Trim() == String.Empty)
        {
            errorProvider.SetError(authBox, "Author is required");
            e.Cancel = true;
        }
        else
        {
            errorProvider.SetError(authBox, "");
        }
    }

    private void yearBox_Validating(object sender, CancelEventArgs e)
    {
        if (yearBox.Text.Trim() == String.Empty)
        {
            errorProvider.SetError(yearBox, "Year is required");
            e.Cancel = true;
        }
        else
        {
            errorProvider.SetError(yearBox, "");
        }
    }

    private void editBox_Validating(object sender, CancelEventArgs e)
    {
        if (editBox.Text.Trim() == String.Empty)
        {
            errorProvider.SetError(editBox, "Edition is required");
            e.Cancel = true;
        }
        else
        {
            errorProvider.SetError(editBox, "");
        }
    }

    private void pubComboBox_Validating(object sender, CancelEventArgs e)
    {
        if (pubComboBox.Text.Trim() == String.Empty)
        {
            errorProvider.SetError(pubComboBox, "Publisher is required");
            e.Cancel = true;
        }
        else
        {
            errorProvider.SetError(pubComboBox, "");
        }
    }

    private void descBox_Validating(object sender, CancelEventArgs e)
    {
        if (descBox.Text.Trim() == String.Empty)
        {
            errorProvider.SetError(descBox, "Description is required");
            e.Cancel = true;
        }
        else
        {
            errorProvider.SetError(descBox, "");
        }
    }

那么，我不知道有什么方法可以通过按“创建”按钮来强制更改焦点或类似内容吗？
谢谢

Answer 1

尝试使用ValidateChildren():

private void createButton_Click(object sender, EventArgs e)
{
     bool gotIssues = this.ValidateChildren();
     if (gotIssues) 
     {
         // someone didn't validate well...
     }
}