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Setup

  • 2 lists, linked by a lookup in one of the lists
  • CamlQuery to get items together with fields from other list (projectedfields)

Problem

When I retreive the listitems with the CAMLQuery, it works. All correct listitems are returned. But when I try to convert the ProjectedFields, it fails and throws an error (see below)

Error

The type 'Microsoft.SharePoint.Client.FieldLookupValue' exists in both 'Microsoft.SharePoint.Client.dll' and 'Microsoft.SharePoint.Client.dll'

Code

var foo = (FieldLookupValue)listItem["bar"]

Type

When I'm in debugmode and try to get the type of the field (immediate window):

listItem["bar"].GetType()

{Name = "FieldLookupValue" FullName = "Microsoft.SharePoint.Client.FieldLookupValue"} [System.RuntimeType]: {Name = "FieldLookupValue" FullName = "Microsoft.SharePoint.Client.FieldLookupValue"} base: {Name = "FieldLookupValue" FullName = "Microsoft.SharePoint.Client.FieldLookupValue"} Assembly: {Microsoft.SharePoint.Client, Version=16.1.3912.1204, Culture=neutral, PublicKeyToken=71e9bce111e9429c} AssemblyQualifiedName: "Microsoft.SharePoint.Client.FieldLookupValue, Microsoft.SharePoint.Client, Version=16.1.3912.1204, Culture=neutral, PublicKeyToken=71e9bce111e9429c" Attributes: Public | BeforeFieldInit BaseType: {Name = "ClientValueObject" FullName = "Microsoft.SharePoint.Client.ClientValueObject"} ContainsGenericParameters: false DeclaringMethod: 'listItem["bar"].GetType().DeclaringMethod' threw an exception of type 'System.InvalidOperationException' DeclaringType: null FullName: "Microsoft.SharePoint.Client.FieldLookupValue" GenericParameterAttributes: 'listItem["bar"].GetType().GenericParameterAttributes' threw an exception of type 'System.InvalidOperationException' GenericParameterPosition: 'listItem["bar"].GetType().GenericParameterPosition' threw an exception of type 'System.InvalidOperationException' GenericTypeArguments: {System.Type[0]} GUID: {601ca347-ae93-3db5-ac96-5aa71e30632f} HasElementType: false IsAbstract: false IsAnsiClass: true IsArray: false IsAutoClass: false IsAutoLayout: true IsByRef: false IsClass: true IsCOMObject: false IsConstructedGenericType: false IsContextful: false IsEnum: false IsExplicitLayout: false IsGenericParameter: false IsGenericType: false IsGenericTypeDefinition: false IsImport: false IsInterface: false IsLayoutSequential: false IsMarshalByRef: false IsNested: false IsNestedAssembly: false IsNestedFamANDAssem: false IsNestedFamily: false IsNestedFamORAssem: false IsNestedPrivate: false IsNestedPublic: false IsNotPublic: false IsPointer: false IsPrimitive: false IsPublic: true IsSealed: false IsSecurityCritical: false IsSecuritySafeCritical: false IsSecurityTransparent: true IsSerializable: false IsSpecialName: false IsUnicodeClass: false IsValueType: false IsVisible: true MemberType: TypeInfo Module: {Microsoft.SharePoint.Client.dll} Namespace: "Microsoft.SharePoint.Client" ReflectedType: null StructLayoutAttribute: {System.Runtime.InteropServices.StructLayoutAttribute} TypeHandle: {System.RuntimeTypeHandle} TypeInitializer: null UnderlyingSystemType: {Name = "FieldLookupValue" FullName = "Microsoft.SharePoint.Client.FieldLookupValue"}

-1

Try

FieldUserValue fuv = (FieldUserValue)item["FIELD_NAME"];
fuv.LookupValue.ToString()

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