DataGridView 自动高度 - 如何自动调整 DataGridView 高度?

问题描述

我正在尝试根据 DataGridView 包含的行数设置它的高度.目前，我能够通过以下行完成此操作:

I am trying to make the height of my DataGridView AutoSize based on the amount of rows it contains. Currently, I was able to accomplish this with the following line:

dataGridView_SearchResults.AutoSize = true;

然而这会使水平滚动条消失，DataGridView 被切断.

However this makes the Horizontal scroll bar disappear, the the DataGridView gets cut off.

如何在不丢失水平滚动条的情况下自动调整高度?

How can I autosize the height without losing the horizontal scroll bar?

推荐答案

选项 1 - 覆盖 GetPreferredSize

您可以覆盖 GetPreferredSize 方法 DataGridView 并使用新的建议大小调用基础方法 new Size(this.Width, proposalSize.Height).这样，控件的当前宽度将保持不变，而自动调整大小规则将应用于其高度:

You can override GetPreferredSize method of DataGridView and call the base method using new proposed size new Size(this.Width, proposedSize.Height). This way, the current width of control will remain untouched while the auto-size rules will apply on its height:

using System.Drawing;
using System.Windows.Forms;
public class MyDataGridView : DataGridView
{
    public override Size GetPreferredSize(Size proposedSize)
    {
        return base.GetPreferredSize(new Size(this.Width, proposedSize.Height));
    }
}

选项 2 - 根据计算的自动大小的高度设置高度

如果你不想从 DataGridView 派生，你可以通过调用它的 GetPreferredSize 传递 new Size(0, 0) 来计算自动大小 然后将DataGridView的高度设置为result的高度，这样你只需要改变DataGridView的高度.您应该在 RowsAdded、RowsRemoved、其他一些事件(如果需要)中设置自动高度:

If you don't want to derive from DataGridView, you can calculate the auto-size by calling its GetPreferredSize passing new Size(0, 0) then set the height of DataGridView to the height of result, this way you only change the height of DataGridView. You should set the auto-height in RowsAdded, RowsRemoved, some other events if you need:

void AutoHeightGrid(DataGridView grid)
{
    var proposedSize = grid.GetPreferredSize(new Size(0, 0));
    grid.Height = proposedSize.Height;
}
private void Form1_Load(object sender, EventArgs e)
{
    dataGridView1.RowsAdded += (obj, arg) => AutoHeightGrid(dataGridView1);
    dataGridView1.RowsRemoved += (obj, arg) => AutoHeightGrid(dataGridView1);
    //Set data source
    //dataGridView1.DataSource = something;
}

如果您想确保网格中的所有更改包括更改字体、行高都会导致调整网格大小，您可以在Paint事件中调用该方法.

If you want to make sure that all changes in grid including changing Font, height of rows will cause resizing grid, you can call the method in Paint event.

选项 3 - 设置 MaximumSize

同样如 Hans 所提到的，如果您不想从 DataGridView 派生，您可以使用网格的 MaximumSize 属性.您可以将其设置为 new Size(this.dataGridView1.Width, 0):

Also as mentioned by Hans, if you don't want to derive from DataGridView, you can use MaximumSize property of the grid. You can set it to new Size(this.dataGridView1.Width, 0):

dataGridView1.MaximumSize = new Size(this.dataGridView1.Width, 0);
dataGridView1.AutoSize = true;

注意

由于使用MaximumSize不是那么友好，当用户希望通过左右锚点让网格宽度改变时，我更喜欢使用Option 1或选项 2.

Since using MaximumSize is not so friendly when the user wants to let the grid width change by left and right anchors, I prefer to use Option 1 or Option 2.

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