WinForms自定义UserControl标签文本显示不全问题求助

我在WinForms中开发了名为DownloadProgressInfo的自定义UserControl，相关代码如下：

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 UC
{
    public partial class DownloadProgressInfo : UserControl
    {
        public Label lblSizeValue { get; private set; }
        public Label lblDownloadedValue { get; private set; }
        public Label lblImagesLeftValue { get; private set; }
        public Label lblSpeedValue { get; private set; }

        public DownloadProgressInfo()
        {
            InitializeComponent();

            var flp = new FlowLayoutPanel
            {
                Width = 216,
                Height = 117,
                Location = new Point(10, 10),
                Font = new Font("Microsoft Sans Serif", 14)
            };
            Controls.Add(flp);

            // Put the labels to the dictionary for better processing.
            var labels = new Dictionary<string, string>
            {
                { "Size:", "0.000 MB" },
                { "Downloaded:", "0.000 MB" },
                { "Images left:", "0" },
                { "Speed:", "0.000 MB/s" },
            };

            // Go through each label
            foreach (var line in labels)
            {
                // Each line consists of two labels: Text + Value
                // Each label has its own color.
                var keyLabel = new Label() { Text = line.Key, ForeColor = Color.Green };
                var valueLabel = new Label() { Text = line.Value, ForeColor = Color.Red };

                // Save the value label to the appropriate property
                switch (line.Key)
                {
                    case "Size:":
                        lblSizeValue = valueLabel;
                        break;

                    case "Downloaded:":
                        lblDownloadedValue = valueLabel;
                        break;

                    case "Images left:":
                        lblImagesLeftValue = valueLabel;
                        break;

                    case "Speed:":
                        lblSpeedValue = valueLabel;
                        break;
                }

                flp.Controls.Add(keyLabel);
                flp.Controls.Add(valueLabel);

                // Break after each line
                flp.SetFlowBreak(valueLabel, true);
            }
        }

        public void UpdateDownloadProgress(double totalBytes, double downloadedBytes, int imagesLeft, double speed)
        {
            string[] sizes = { "B", "KB", "MB", "GB" };
            string totalSizeText = $"{totalBytes:N0} bytes";
            string downloadedSizeText = $"{downloadedBytes:N0} bytes";

            int totalSizeIndex = 0;

            while (totalBytes >= 1024 && totalSizeIndex < sizes.Length - 1)
            {
                totalBytes /= 1024;
                totalSizeIndex++;
            }

            totalSizeText = $"{totalBytes:N2} {sizes[totalSizeIndex]}";

            int downloadedSizeIndex = 0;

            while (downloadedBytes >= 1024 && downloadedSizeIndex < sizes.Length - 1)
            {
                downloadedBytes /= 1024;
                downloadedSizeIndex++;
            }

            downloadedSizeText = $"{downloadedBytes:N2} {sizes[downloadedSizeIndex]}";

            // Update the labels with the new values
            lblSizeValue.Text = totalSizeText;
            lblDownloadedValue.Text = downloadedSizeText;
            lblImagesLeftValue.Text = imagesLeft.ToString();
            lblSpeedValue.Text = $"{speed:F3} MB/s";
        }
    }
}

将该UserControl拖入Form1设计器后，“Downloaded:”标签仅显示“Download”，“Images left:”标签仅显示“Images”，无法看到完整文本。调整控件大小后问题仍未解决。

解决办法 #

1. 开启Label的自动尺寸适应 #

创建Label时显式设置AutoSize = true，让Label根据文本内容自动调整宽度，避免截断：

var keyLabel = new Label() { Text = line.Key, ForeColor = Color.Green, AutoSize = true };
var valueLabel = new Label() { Text = line.Value, ForeColor = Color.Red, AutoSize = true };

2. 调整FlowLayoutPanel宽度（可选） #

如果开启AutoSize后，内部控件总宽度超过了FlowLayoutPanel的设定宽度，需要适当调大其Width值，确保有足够空间容纳文本：

var flp = new FlowLayoutPanel
{
    Width = 300, // 增大宽度，适配长文本
    Height = 117,
    Location = new Point(10, 10),
    Font = new Font("Microsoft Sans Serif", 14)
};

3. 确保UserControl自身尺寸足够 #

在UserControl构造函数末尾，设置自身自动适应尺寸，或者手动指定足够的大小：

this.AutoSize = true;
// 或者手动设置：
// this.Size = new Size(flp.Width + 20, flp.Height + 20);

内容的提问来源于stack exchange，提问作者Daniel Lip