回答編集履歴
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見直しキャンペーン中
answer
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`Grid`の`ColumnDefinition
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml
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xmlns:
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</
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```
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`Grid`の`ColumnDefinition.Width`のように、`DataGridColumn.Width`も`Auto`・`Pixel`（数値）以外に、`Star`・`SizeToCells`・`SizeToHeader`も指定できます。
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水平スクロールバーがチラチラ出るので、消したほうがいいでしょう。
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[DataGrid コントロールのサイズ変更方法 # 列および列ヘッダーのサイズ変更 - WPF | Microsoft Docs ](https://docs.microsoft.com/ja-jp/dotnet/framework/wpf/controls/sizing-options-in-the-datagrid-control#sizing-columns-and-column-headers)
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```xml
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<Window
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x:Class="Questions265873.MainWindow"
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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xmlns:System="clr-namespace:System;assembly=mscorlib"
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Width="800"
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Height="450">
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<Grid>
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<DataGrid AutoGenerateColumns="False" ScrollViewer.HorizontalScrollBarVisibility="Disabled">
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<DataGrid.Columns>
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<DataGridTextColumn
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Width="Auto"
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Binding="{Binding}"
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Header="Auto" />
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<DataGridTextColumn
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Width="SizeToHeader"
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Binding="{Binding}"
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Header="SizeToHeader" />
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<DataGridTextColumn
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Width="SizeToCells"
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Binding="{Binding}"
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Header="SizeToCells" />
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<DataGridTextColumn
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Width="200"
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Binding="{Binding}"
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Header="Pixel200" />
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<DataGridTextColumn
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Width="*"
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Binding="{Binding}"
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Header="Star" />
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<DataGridTextColumn
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Width="2*"
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Binding="{Binding}"
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Header="2Star" />
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</DataGrid.Columns>
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<System:String>aaaa</System:String>
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<System:String>aaaaaaaaa</System:String>
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</DataGrid>
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</Grid>
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</Window>
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```
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