回答編集履歴
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見直しキャンペーン中
test
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UWPで作るのでしたら、こちらが参考になるでしょう。
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[Lock screen personalization sample - Code Samples | Microsoft Docs](https://docs.microsoft.com/en-us/samples/microsoft/windows-universal-samples/personalization/)
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それ以外で作る場合は、NuGetで`Microsoft.Windows.SDK.Contracts`を入れれば簡単に使えます。
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.NET 6 以降ではさらに簡単になっています（TFMを変えるだけ）
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[デスクトップ アプリで Windows ランタイム API を呼び出す - Windows apps | Microsoft Learn](https://learn.microsoft.com/ja-jp/windows/apps/desktop/modernize/desktop-to-uwp-enhance)
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```cs
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using System;
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using System.Threading.Tasks;
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using Windows.Storage;
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using Windows.System.UserProfile;
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namespace Questions254323
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{
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class Program
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{
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static async Task Main()
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{
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var file = await StorageFile.GetFileFromPathAsync(@"C:\Windows\Web\Screen\img101.png");
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await LockScreen.SetImageFileAsync(file);
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}
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}
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}
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```
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[StorageFile.GetFileFromPathAsync(String) メソッド (Windows.Storage) - Windows UWP applications | Microsoft Learn](https://learn.microsoft.com/ja-jp/uwp/api/windows.storage.storagefile.getfilefrompathasync)
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namespace Questions254323
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{
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class Program
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{
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static async Task Main()
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{
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var file = await StorageFile.GetFileFromPathAsync(@"C:\Windows\Web\Screen\img101.png");
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await LockScreen.SetImageFileAsync(file);
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}
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}
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}
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```
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[LockScreen.SetImageFileAsync(IStorageFile) メソッド (Windows.System.UserProfile) - Windows UWP applications | Microsoft Learn](https://learn.microsoft.com/ja-jp/uwp/api/windows.system.userprofile.lockscreen.setimagefileasync)
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