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Win Forms DataGridView 水平滚动条

发布于 10-21 09:26 字数 189 浏览 8 评论 0原文

是否可以在 Windows Forms 2.0 中永久显示 DataGridView 的水平滚动条。就像我们可以在面板的水平滚动条中所做的那样。

目前，只有当列的宽度总和大于 DataGridView 宽度时，Horizontal ScrollBar 才可见。但我希望这个滚动条始终可见。

谢谢

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情场扛把子2024-10-28 09:26:24

正如评论中提到的，DataGridView 控制其滚动条，并且如果不需要查看它们，则始终希望隐藏它们，例如，所有单元格都适合网格的可见区域。

但是，有一种方法可以强制 DataGridView 使用反射显示其滚动条，尽管这是一种 hack，我不建议这样做。下面是一个例子：

public Form1()
{
    InitializeComponent();

    // assuming dataGridView1 is a DataGridView control placed on the Form1 form
    PropertyInfo property = dataGridView1.GetType().GetProperty(
        "HorizontalScrollBar", BindingFlags.NonPublic | BindingFlags.Instance);
    if (property != null)
    {
        ScrollBar scrollbar = (ScrollBar)property.GetValue(dataGridView1, null);
        scrollbar.Visible = true;
        scrollbar.VisibleChanged += new EventHandler(ScrollBar_VisibleChanged);
    }
}

void ScrollBar_VisibleChanged(object sender, EventArgs e)
{
    FieldInfo field = dataGridView1.GetType().GetField(
        "layout", BindingFlags.NonPublic | BindingFlags.Instance);
    if (field != null)
    {
        object layoutData = field.GetValue(dataGridView1);
        FieldInfo insideField = layoutData.GetType().GetField(
            "Inside", BindingFlags.Public | BindingFlags.Instance);
        Rectangle rect = (Rectangle)insideField.GetValue(layoutData); 

        ScrollBar scrollBar = (ScrollBar)sender;
        scrollBar.Visible = true;
        scrollBar.SetBounds(
            rect.Left, rect.Height - scrollBar.Height + 1,
            rect.Width, scrollBar.Height);
    }
}

希望这有帮助，问候

As it was mentioned in comments DataGridView controls its scrollbars and always wants to hide them if there is no need in viewing them, e.g. all cells fit into grid's visible area.

However, there is a way to force DataGridView to show its scroll bars using reflection, though it's a hack and I wouldn't recommend doing this. Below is an example:

public Form1()
{
    InitializeComponent();

    // assuming dataGridView1 is a DataGridView control placed on the Form1 form
    PropertyInfo property = dataGridView1.GetType().GetProperty(
        "HorizontalScrollBar", BindingFlags.NonPublic | BindingFlags.Instance);
    if (property != null)
    {
        ScrollBar scrollbar = (ScrollBar)property.GetValue(dataGridView1, null);
        scrollbar.Visible = true;
        scrollbar.VisibleChanged += new EventHandler(ScrollBar_VisibleChanged);
    }
}

void ScrollBar_VisibleChanged(object sender, EventArgs e)
{
    FieldInfo field = dataGridView1.GetType().GetField(
        "layout", BindingFlags.NonPublic | BindingFlags.Instance);
    if (field != null)
    {
        object layoutData = field.GetValue(dataGridView1);
        FieldInfo insideField = layoutData.GetType().GetField(
            "Inside", BindingFlags.Public | BindingFlags.Instance);
        Rectangle rect = (Rectangle)insideField.GetValue(layoutData); 

        ScrollBar scrollBar = (ScrollBar)sender;
        scrollBar.Visible = true;
        scrollBar.SetBounds(
            rect.Left, rect.Height - scrollBar.Height + 1,
            rect.Width, scrollBar.Height);
    }
}

hope this helps, regards

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