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見直しキャンペーン中
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C#コード側から`DataInfo`のプロパティを変更する場合は、`DataInfo`に`INotifyPropertyChanged`を実装してください。
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WPFにおいて`INotifyPropertyChanged`は最重要インターフェースです。
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[INotifyPropertyChanged インターフェイス (System.ComponentModel) | Microsoft Docs](https://docs.microsoft.com/ja-jp/dotnet/api/system.componentmodel.inotifypropertychanged)
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`vmDataInfo`の`get`・`set`でやっていることを、`SelectIndex`でもやるということです（逆に`vmDataInfo`でやる意味はないです）
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```
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```cs
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using Livet;
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using System.Collections.ObjectModel;
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namespace Questions355938.ViewModels
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{
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public class DataInfo : ViewModel
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{
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private string _SelectIndex;
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public string SelectIndex
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{
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get => _SelectIndex;
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set
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{
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//if (_SelectIndex != value)
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//{
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// _SelectIndex = value;
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// RaisePropertyChanged();
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//}
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// ↑の短縮形
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RaisePropertyChangedIfSet(ref _SelectIndex, value);
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}
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}
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public string ParamName { get; set; }
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public int Param1 { get; set; }
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public int Param2 { get; set; }
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}
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class MainWindowVM : ViewModel
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{
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public ObservableCollection<DataInfo> vmDataInfo { get; }
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public MainWindowVM()
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{
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vmDataInfo = new ObservableCollection<DataInfo>
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{
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new DataInfo { ParamName = "Parameter 1", Param1 = 100, Param2 = 0 },
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new DataInfo { ParamName = "Parameter 2", Param1 = 200, Param2 = 99 },
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new DataInfo { ParamName = "Parameter 3", Param1 = 300, Param2 = 199 },
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new DataInfo { ParamName = "Parameter 4", Param1 = 400, Param2 = 299 },
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new DataInfo { ParamName = "Parameter 5", Param1 = 500, Param2 = 399 },
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};
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}
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public void CurrentCellChanged(object sender)
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{
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if (sender is DataInfo info)
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{
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var selectIndex = 0;
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foreach (var data in vmDataInfo)
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{
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if (info.ParamName == data.ParamName)
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{
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vmDataInfo[selectIndex].SelectIndex = "●";
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else
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{
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vmDataInfo[selectIndex].SelectIndex = "";
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}
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else
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{
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vmDataInfo[selectIndex].SelectIndex = "";
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selectIndex++;
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}
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}
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}
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}
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}
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```
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