Question

当实体框架保存更改时，我开发了重置缓存的方法。我在objectContext_SavingChanges

处理此事件

    private void objectContext_SavingChanges(object sender, EventArgs e)
    {
        if (_cacheProvider != null)
        {
            var objectContext = (this as IObjectContextAdapter).ObjectContext;
            var entries =
                objectContext.ObjectStateManager.GetObjectStateEntries(EntityState.Modified | EntityState.Added);
            var result = new List<string>();

            if (entries != null && entries.Any())
            {
                foreach (var entry in entries.Where(entry => !entry.IsRelationship))
                {
                    var entity = entries.Select(r => r.Entity).FirstOrDefault();
                    if (entity != null)
                    {
                        var genericTypeName =
                            typeof(List<>).MakeGenericType(ObjectContext.GetObjectType(entity.GetType()))?.ToString();
                        _cacheProvider.ResetCache(genericTypeName);
                    }
                }

                foreach (var entry in entries.Where(entry => entry.IsRelationship))
                {
                    var set = entry.EntitySet as AssociationSet;
                    if(set !=null)
                    {
                        var firstEntitySet = set.AssociationSetEnds[0].EntitySet;
                        var secondEntitySet = set.AssociationSetEnds[1].EntitySet;

                        var firstEntitySetName = firstEntitySet.ElementType.FullName + "," + Assembly.GetExecutingAssembly().FullName;
                        var secondEntitySetName = secondEntitySet.ElementType.FullName + "," + Assembly.GetExecutingAssembly().FullName;

                        var firstGenericTypeName =
                            typeof(List<>).MakeGenericType((Type.GetType(firstEntitySetName)))?.ToString();

                        var secondGenericTypeName =
                            typeof(List<>).MakeGenericType((Type.GetType(secondEntitySetName)))?.ToString();

                        _cacheProvider.ResetCache(firstGenericTypeName);
                        _cacheProvider.ResetCache(secondGenericTypeName);
                    }
                }                    
            }
        }
    }

它适用于实体对象状态条目的条目，但不适用于关联集。我需要为关系的其他方面的两个实体重置缓存。 AssociationSet有＆＃34; FullName＆＃34;属性，但此属性不包含类型的真实名称。它包含类型和程序集名称的简称，但不包含解决方案中的完整命名空间。

例如，类型在解决方案DataAccess.Entities.CachedEntity中具有真实全名，命名空间：DataAccess.Entities，短名称：CachedEntity。但关联集中的全名将为DataAccess.CachedEntity。

我可以为关系的每一端获得类型的全名吗？

Answer 1

我决定这个任务：

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    <div id="MediaInnholdFortegnelse">
        <h1>MEDIA KATEGORIER</h1>
        <button type="button", id="MIF-Bilder">
            <div class="MIF-ButtonContent">
                <i class="material-icons md-c">arrow_drop_down</i>
                <p>Bilder</p>
            </div>
        </button>
        <div id="MIF-Bilder-Content", class="MIF-Content"></div>
        <button type="button", id="MIF-Lydfiler">
            <div class="MIF-ButtonContent">
                <i class="material-icons md-c">arrow_drop_down</i>
                <p>Lydfiler</p>
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        </button>
        <div id="MIF-Lydfiler-Content", class="MIF-Content"></div>
        <button type="button", id="MIF-Videoer">
            <div class="MIF-ButtonContent">
                <i class="material-icons md-c">arrow_drop_down</i>
                <p>Videoer</p>
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        </button>
        <div id="MIF-Videoer-Content", class="MIF-Content"></div>
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            <div class="MIF-ButtonContent">
                <i class="material-icons md-c">arrow_drop_down</i>
                <p>Skjema</p>
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        </button>
        <div id="MIF-Skjema-Content", class="MIF-Content">
    </div>
</div>

我们可以在EDM中使用CLR类型的名称空间var clrTypeNamespace = @"http://schemas.microsoft.com/ado/2013/11/edm/customannotation:ClrType"; var firstEdmType = set.AssociationSetEnds[0]?.EntitySet?.ElementType; var secondEdmType = set.AssociationSetEnds[1]?.EntitySet?.ElementType; var firstType = firstEdmType?.MetadataProperties.SingleOrDefault(p => p.Name == clrTypeNamespace)?.Value as Type; var secondType = secondEdmType?.MetadataProperties.SingleOrDefault(p => p.Name == clrTypeNamespace)?.Value as Type;，并在clrTypeNamespace

中查找实体的实体类型

此外，我们可以为每个关系的集合使用导航属性。但是，当关系的两侧存在导航属性时，此解决方案可用于情况。

MetadataProperties

如何在实体框架中获取关联集末端的实体类型？

1 个答案: