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Theinstanceofentity type'CodingRule'cannotbetrackedbecauseanotherinstancewiththesamekeyvaluefor{ld'}isalreadybeingtracked.Whenattachingexistingentities,ensurethatonlyoneentityinstance with a givenkeyvalue is attached. Consider using'DbContextOptionsBuilder.EnableSensitiveDataLogging'toseetheconflictingkeyvalues.

这个错误提示 The instance of entity type 'CodingRule' cannot be tracked because another instance with the same key value for '{ld}' is already being tracked 意味着你的 DbContext 实例中已经有一个具有相同主键值的 CodingRule 实体在被跟踪，因此无法再次跟踪相同主键值的另一个 CodingRule 实体。

解决办法：

在后端更新时，重新刷新UI

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//重新刷新UI
StateHasChanged();
//测试后没用，因为只涉及到UI的

·········没用

———-2024.8.14更新

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//更新前查询要更新的实体是否已经被跟踪
var existingEntity = _context.ChangeTracker.Entries<CodingRule>()
    .FirstOrDefault(e => e.Entity.Id == codingRule.Id)?.Entity;

//如果已跟踪
if (existingEntity != null)
{
    //将状态设置为分离
    _context.Entry(existingEntity).State = Microsoft.EntityFrameworkCore.EntityState.Detached;
}