C#:Net Core 3.1 包含 Linq 导致客户端异常错误 [英] C#: Net Core 3.1 Contains Linq causes Client Side Exception Error

问题描述

以下是在 Net Core 3.1 中引发客户端异常错误

不知道为什么，PropertyIdentifier 在 Property Entity Data 表和类中.

有人知道怎么解决吗?

 public async Task>GetByPropertyIdentifier(List identifiers){var 属性 = await _dataContext.Property.Where(x => identifiers.Contains(x.PropertyIdentifier)).ToListAsync();返回 properties.Select(_mapper.Map);}

<块引用>

错误:错误:"无效请求:LINQ 表达式 'DbSet.Where(p => __identifiers_0.Contains(p.PropertyIdentifier))' 无法翻译.以可翻译的形式重写查询，或通过插入对 AsEnumerable()、AsAsyncEnumerable()、ToList() 或 ToListAsync() 的调用显式切换到客户端评估.

资源:(但是没有调用不同的)*也不想要强制客户端评估的解决方案，因为它的查询很大

解决方案

请将标识符更改为可枚举.下面的这个资源是不正确的.将其转换为 Enumerable 以进行标识符工作.投射到列表对我不起作用.

EF Core 3 x.Contains() 在表达式中，其中 x 是 ICollection

 public async Task>GetByPropertyIdentifier(List identifiers){var identifiersEnumerable = identifiers.AsEnumerable();var 属性 = await _dataContext.Property.Where(x => identifiersEnumerable.Contains(x.PropertyIdentifier)).ToListAsync();返回 properties.Select(_mapper.Map);}

The following is throwing a Client Side Exception error in Net Core 3.1

Not sure why, PropertyIdentifier is in Property Entity Data table and class.

Does anyone know how to fix?

  public async Task<IEnumerable<PropertyDto>> GetByPropertyIdentifier(List<string> identifiers)
    {
        var properties = await _dataContext.Property
            .Where(x => identifiers.Contains(x.PropertyIdentifier))
            .ToListAsync();

        return properties.Select(_mapper.Map);
    }

Error: error: "Invalid request: The LINQ expression 'DbSet .Where(p => __identifiers_0.Contains(p.PropertyIdentifier))' could not be translated. Either rewrite the query in a form that can be translated, or switch to client evaluation explicitly by inserting a call to either AsEnumerable(), AsAsyncEnumerable(), ToList(), or ToListAsync().

Resource: (No distinct is being called however) *Also do not want solution which forces client side evaluation, since its large query

EF Core 3.1 throws an exception for Contains

Using Net Core 3.1

public partial class Property
{
    public Property()
    {
        AddressChangeRequest = new HashSet<AddressChangeRequest>();
        CalamityEventHistory = new HashSet<CalamityEventHistory>();
        CutHistoryPropertyChildProperty = new HashSet<CutHistoryProperty>();
       ....}

    public int PropertyId { get; set; }
    public int? LkPropertyTypeId { get; set; }
    public int? LkZoningId { get; set; 
    public string PropertyIdentifier { get; set; }
    ....


 modelBuilder.Entity<Property>(entity =>
        {
            entity.ToTable("Property", "PM");

            entity.HasIndex(e => e.PropertyIdentifier)
                .HasName("Unique_Property_PropertyIdentifier")
                .IsUnique();

            entity.Property(e => e.PropertyIdentifier)
                .HasMaxLength(16)
                .IsUnicode(false);

解决方案

Please Change Identifiers to Enumerable. This resource below is incorrect. Converting it to Enumerable for identifiers works. Casting to List does not work for me.

EF Core 3 x.Contains() in expression where x is ICollection

    public async Task<IEnumerable<PropertyDto>> GetByPropertyIdentifier(List<string> identifiers)
    {
        var identifiersEnumerable = identifiers.AsEnumerable();
        var properties = await _dataContext.Property
            .Where(x => identifiersEnumerable.Contains(x.PropertyIdentifier))
            .ToListAsync();

        return properties.Select(_mapper.Map);
    }

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