我有2個(gè)單獨(dú)的課程列表。1 列表是當(dāng)前課程，另一個(gè)列表是過濾的課程。我想比較列表，如果課程存在或不存在，我想將過濾課程列表中的布爾值標(biāo)記為真或假。下面是示例代碼。var currentCourses = new List<Course> { new Course{CourseNumber = "101", CourseSubject = "ART"}, new Course{CourseNumber = "201", CourseSubject = "BIO"}, new Course{CourseNumber = "301", CourseSubject = "CHEM"}, new Course{CourseNumber = "401", CourseSubject = "CPSC"} }; var filteredCourses = new List<Course> { new Course{CourseNumber = "101", CourseSubject = "ART"}, new Course{CourseNumber = "401", CourseSubject = "CPSC"}, new Course{CourseNumber = "501", CourseSubject = "DANC"}, new Course{CourseNumber = "701", CourseSubject = "HIST"} };我試過了：foreach (var course in currentCourses) { foreach (var filteredCourse in filteredCourses) { if ((filteredCourse.CourseNumber === course.CourseNumber) && (filteredCourse.CourseSubject === course.CourseSubject)) { filteredCourse.AlreadyExists = true; } else { filteredCourse.AlreadyExists = false; } } }
2 回答
絕地?zé)o雙
TA貢獻(xiàn)1946條經(jīng)驗(yàn) 獲得超4個(gè)贊
您應(yīng)該在開始時(shí)將所有標(biāo)志設(shè)置為 false，然后運(yùn)行循環(huán)，并且僅在找到匹配項(xiàng)時(shí)才設(shè)置 true 標(biāo)志。如果您運(yùn)行當(dāng)前代碼，它將完成所有課程，如果匹配的課程不是最后一個(gè)，則標(biāo)志將始終設(shè)置為 false，即使它已設(shè)置為 true。
您還可以在找到匹配項(xiàng)時(shí)中斷循環(huán)。
所以像這樣：
foreach (var filteredCourse in filteredCourses)
filteredCourse.AlreadyExists = false;
foreach (var course in currentCourses)
{
foreach (var filteredCourse in filteredCourses)
{
if ((filteredCourse.CourseNumber == course.CourseNumber) && (filteredCourse.CourseSubject == course.CourseSubject))
{
filteredCourse.AlreadyExists = true;
break;
}
}
}
溫溫醬
TA貢獻(xiàn)1752條經(jīng)驗(yàn) 獲得超4個(gè)贊
您可以使用 LINQ：
foreach (var f in filteredCourses)
{
f.AlreadyExists = currentCourses.Any(c => (c.CourseNumber == f.CourseNumber
&& c.CourseSubject == f.CourseSubject));
}
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