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copied!<p>For Winform Controls:</p> <pre><code>/// <summary> /// Returns whether the function is being executed during design time in Visual Studio. /// </summary> public static bool IsDesignTime(this Control control) { if (LicenseManager.UsageMode == LicenseUsageMode.Designtime) { return true; } if (control.Site != null && control.Site.DesignMode) { return true; } var parent = control.Parent; while (parent != null) { if (parent.Site != null && parent.Site.DesignMode) { return true; } parent = parent.Parent; } return false; } /// <summary> /// Sets the DropDownWidth to ensure that no item's text is cut off. /// </summary> public static void SetDropDownWidth(this ComboBox comboBox) { var g = comboBox.CreateGraphics(); var font = comboBox.Font; float maxWidth = 0; foreach (var item in comboBox.Items) { maxWidth = Math.Max(maxWidth, g.MeasureString(item.ToString(), font).Width); } if (comboBox.Items.Count > comboBox.MaxDropDownItems) { maxWidth += SystemInformation.VerticalScrollBarWidth; } comboBox.DropDownWidth = Math.Max(comboBox.Width, Convert.ToInt32(maxWidth)); } </code></pre> <p>IsDesignTime Usage:</p> <pre><code>public class SomeForm : Form { public SomeForm() { InitializeComponent(); if (this.IsDesignTime()) { return; } // Do something that makes the visual studio crash or hang if we're in design time, // but any other time executes just fine } } </code></pre> <p>SetDropdownWidth Usage:</p> <pre><code>ComboBox cbo = new ComboBox { Width = 50 }; cbo.Items.Add("Short"); cbo.Items.Add("A little longer"); cbo.Items.Add("Holy cow, this is a really, really long item. How in the world will it fit?"); cbo.SetDropDownWidth(); </code></pre> <p>I forgot to mention, feel free to use these on Codeplex...</p>

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