我有一个DataGridView，是通过编程填充的。根据单元格内容设置自动调整列宽度。
DataGridView将显示有关液压和气动原理图零件信息。我的表单只有一个SplitContainer、一个PictureBox和DataGridView。 SplitterDistance与DataGridView的宽度相连。
DataGridView最多只有6列 ("Index", "Part Number", "Serial Number", "Drawing Number", "Page Number", "Revision Number")，最少2列，具体取决于原理图的要求。因此，我希望相应地调整控件的大小。
如何使DataGridView控件调整为列的总宽度，以便不出现滚动条？
dataGridView1.Width =
dataGridView1.Columns.Cast<DataGridViewColumn>().Sum(x => x.Width)
+ (dataGridView1.RowHeadersVisible ? dataGridView1.RowHeadersWidth : 0) + 3;
它在做什么：
3，否则水平滚动条会��直出现-可能是因为网格周围存在边距/填充。+3 替换为 dataGridView1.Margin.Horizontal；并且可以使用 (new int[] {...).Min(); 来限制宽度，例如将其限制在 Parent.Width 或 dataGridView1.Maximum.Width 上，以解决 @GrantWinney 的问题。 - woodviColumns.Cast<DataGridViewColumn>().Where(x => x.Visible).Sum(x => x.Width) - 这不是原始问题中的内容，但其他人（比如我）可能会在这种情况下尝试使用此代码。 - Loring好的，为了澄清您的需求（并回答它），我认为您希望使DataGridView的宽度自动扩展，以便不会出现水平滚动条？（顺便说一下，您也可以将包含它的表单增大）
例如，现在我有：
这里有三列，分别是1、2和3。
我希望datagridview能够扩展到适合所有列的大小。
假设有更多的数据被添加进来
我可以通过这两行代码扩展单元格,
dataGridView1.AutoSizeRowsMode = DataGridViewAutoSizeRowsMode.AllCells;
dataGridView1.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.AllCells;
但我仍然会出现水平滚动条，因为DataGridView的大小没有改变，即使每列的大小已经改变。
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace automaticallyexpanddatagridviewsizeandformsize
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
// MessageBox.Show(dataGridView1.Size.Width.ToString());
// note that with these two set you can't change the width of a column
// also MininimumWidth would limit changing the width of a column too,
//https://dev59.com/6XI95IYBdhLWcg3wyRE0
// but that doesn't matter because we aren't programmatically changing the width of any column.
dataGridView1.AutoSizeRowsMode = DataGridViewAutoSizeRowsMode.AllCells;
dataGridView1.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.AllCells;
}
private void dataGridView1_CellEndEdit(object sender, DataGridViewCellEventArgs e)
{
int olddgvsize = dataGridView1.Width;
textBox1.Text = dataGridView1.Columns[0].Width.ToString();
int h=dataGridView1.Height;
int tw = 0;
for (int i = 0; i < dataGridView1.Columns.Count; i++)
{
// MessageBox.Show(dataGridView1.Columns[i].Width.ToString());
tw += dataGridView1.Columns[i].Width;
}
tw += 50; // column before col 0..
//you only need one of these.
//though to better understand the code you can try to comment out both and see how the total width of all columns (tw)(+50) so ALL the columns, differs from the DataGridView.Width (the total area which includes all columns plus some grey if it's much bigger than all the columns)
dataGridView1.Size = new Size(tw, h);
dataGridView1.Width = tw;
textBox1.Text = "tw=" + tw + " " + "dgvw=" + " " +dataGridView1.Width+ " "+"col 1:" + dataGridView1.Columns[0].Width + " col 2:" + dataGridView1.Columns[1].Width + " col 3:"+ dataGridView1.Columns[2].Width;
int newdgvsize = dataGridView1.Width;
int differenceinsizeofdgv = newdgvsize - olddgvsize;
this.Width = this.Width + differenceinsizeofdgv;
}
}
}
例如，我有：
tw是所有列的总宽度（包括位于第一列左侧的奇怪列，我认为其宽度为50，但可能不是）
dgvw是dataGridView的宽度
上述代码还通过dataGridView扩展的数量来扩展表单。
private void Form1_Load(object sender, EventArgs e)
{
//Create datagridview and button below it.
DataGridView dgv = new DataGridView();
dgv.Columns.Add("Column1","Column1");
dgv.Rows.Add(2);
dgv.AllowUserToAddRows = false;
this.Controls.Add(dgv);
dgv.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.AllCells;
dgv.AutoSizeRowsMode = DataGridViewAutoSizeRowsMode.AllCells;
int tw;
tw = dgv.Columns.GetColumnsWidth(DataGridViewElementStates.None) + dgv.RowHeadersWidth + 2;
dgv.Width = tw;
// the cellleave, is done before the autoresize.
// but performing a button click, that triggers a cell autoresize!
//performing a click to a button added to the form..does the autoresize.
// so the resie has to be done after the click... either in the click code, or in the celleave procedure after the performclick.
Button by = new Button();
this.Controls.Add(by); // necessary for the dgv to resize
// but doesn't need the code to necessarily be within the click.
by.Click += (object ssender, EventArgs ee) => { };
dgv.CellEndEdit += (object ssender, DataGridViewCellEventArgs ee) => {
by.PerformClick();
tw = dgv.Columns.GetColumnsWidth(DataGridViewElementStates.None) + dgv.RowHeadersWidth + 2;
dgv.Width = tw;
};
}