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Showing content from https://apidocs.umbraco.com/v15/csharp/api/Umbraco.Cms.Core.ExpressionHelper.html below:

View Source Class ExpressionHelper

A set of helper methods for dealing with expressions

Inheritance

System.Object

Namespace: Umbraco.Cms.Core Assembly: Umbraco.Core.dll Syntax

public static class ExpressionHelper

Methods View Source FindProperty(LambdaExpression) Declaration

public static (MemberInfo, string) FindProperty(LambdaExpression lambda)

Parameters Type Name Description System.Linq.Expressions.LambdaExpression lambda Returns Type Description System.ValueTuple<System.Reflection.MemberInfo, System.String> View Source GetFirstValueFromArguments(IEnumerable<Expression>)

Gets the first value from the supplied arguments of an expression, for those arguments that can be cast to System.Linq.Expressions.ConstantExpression.

Declaration

public static object GetFirstValueFromArguments(IEnumerable<Expression> arguments)

Parameters Type Name Description IEnumerable<System.Linq.Expressions.Expression> arguments

The arguments.

Returns Type Description System.Object View Source GetMember(Expression)

Gets a System.Reflection.MemberInfo from an System.Linq.Expressions.Expression provided it refers to member access.

Declaration

public static MemberInfo GetMember(Expression expression)

Parameters Type Name Description System.Linq.Expressions.Expression expression

The expression.

Returns Type Description System.Reflection.MemberInfo View Source GetMemberInfo<T, TReturn>(Expression<Func<T, TReturn>>)

Gets a System.Reflection.MemberInfo from an System.Linq.Expressions.Expression<TDelegate> of provided it refers to member access.

Declaration

public static MemberInfo GetMemberInfo<T, TReturn>(Expression<Func<T, TReturn>> fromExpression)

Parameters Type Name Description System.Linq.Expressions.Expression<Func<T, TReturn>> fromExpression

From expression.

Returns Type Description System.Reflection.MemberInfo

The System.Reflection.MemberInfo or null if fromExpression cannot be converted to System.Linq.Expressions.MemberExpression.

Type Parameters Name Description T TReturn

The type of the return.

View Source GetMethod(Expression)

Gets a System.Reflection.MethodInfo from an System.Linq.Expressions.Expression provided it refers to a method call.

Declaration

public static MethodInfo GetMethod(Expression expression)

Parameters Type Name Description System.Linq.Expressions.Expression expression

The expression.

Returns Type Description System.Reflection.MethodInfo

The System.Reflection.MethodInfo or null if expression cannot be converted to System.Linq.Expressions.MethodCallExpression.

View Source GetMethodInfo<T>(Expression<Action<T>>)

Gets a System.Reflection.MethodInfo from an System.Linq.Expressions.Expression<TDelegate> of provided it refers to a method call.

Declaration

public static MethodInfo GetMethodInfo<T>(Expression<Action<T>> fromExpression)

Parameters Type Name Description System.Linq.Expressions.Expression<Action<T>> fromExpression

From expression.

Returns Type Description System.Reflection.MethodInfo

The System.Reflection.MethodInfo or null if fromExpression is null or cannot be converted to System.Linq.Expressions.MethodCallExpression.

Type Parameters View Source GetMethodInfo<TReturn>(Expression<Func<TReturn>>)

Gets the method info.

Declaration

public static MethodInfo GetMethodInfo<TReturn>(Expression<Func<TReturn>> fromExpression)

Parameters Type Name Description System.Linq.Expressions.Expression<Func<TReturn>> fromExpression

From expression.

Returns Type Description System.Reflection.MethodInfo Type Parameters Name Description TReturn

The return type of the method.

View Source GetMethodInfo<T1, T2>(Expression<Func<T1, T2>>)

Gets the method info.

Declaration

public static MethodInfo GetMethodInfo<T1, T2>(Expression<Func<T1, T2>> fromExpression)

Parameters Type Name Description System.Linq.Expressions.Expression<Func<T1, T2>> fromExpression

From expression.

Returns Type Description System.Reflection.MethodInfo Type Parameters Name Description T1

The type of the 1.

The type of the 2.

View Source GetMethodParams<T1, T2>(Expression<Func<T1, T2>>) Declaration

public static IDictionary<string, object>? GetMethodParams<T1, T2>(Expression<Func<T1, T2>> fromExpression)

Parameters Type Name Description System.Linq.Expressions.Expression<Func<T1, T2>> fromExpression Returns Type Description System.Nullable<IDictionary<System.String, System.Object>> Type Parameters View Source GetPropertyInfo<TSource, TProperty>(TSource, Expression<Func<TSource, TProperty>>)

Gets a System.Reflection.PropertyInfo object from an expression.

Declaration

public static PropertyInfo GetPropertyInfo<TSource, TProperty>(this TSource source, Expression<Func<TSource, TProperty>> propertyLambda)

Parameters Type Name Description TSource source

The source.

System.Linq.Expressions.Expression<Func<TSource, TProperty>> propertyLambda

The property lambda.

Returns Type Description System.Reflection.PropertyInfo Type Parameters Name Description TSource

The type of the source.

TProperty

The type of the property.

View Source GetPropertyInfo<TSource, TProperty>(Expression<Func<TSource, TProperty>>)

Gets a System.Reflection.PropertyInfo object from an expression.

Declaration

public static PropertyInfo GetPropertyInfo<TSource, TProperty>(Expression<Func<TSource, TProperty>> propertyLambda)

Parameters Type Name Description System.Linq.Expressions.Expression<Func<TSource, TProperty>> propertyLambda

The property lambda.

Returns Type Description System.Reflection.PropertyInfo Type Parameters Name Description TSource

The type of the source.

TProperty

The type of the property.

View Source GetStaticMethodInfo(Delegate)

Gets a System.Reflection.MethodInfo from a

Declaration

public static MethodInfo GetStaticMethodInfo(Delegate fromMethodGroup)

Parameters Type Name Description Delegate fromMethodGroup

From method group.

Returns Type Description System.Reflection.MethodInfo View Source IsConstant(Expression)

Determines whether the specified expression is a constant.

Declaration

public static bool IsConstant(Expression expression)

Parameters Type Name Description System.Linq.Expressions.Expression expression

The expression.

Returns Type Description System.Boolean

true if the specified expression is constant; otherwise, false.

View Source IsMember(Expression)

Determines whether the specified expression is a member.

Declaration

public static bool IsMember(Expression expression)

Parameters Type Name Description System.Linq.Expressions.Expression expression

The expression.

Returns Type Description System.Boolean

true if the specified expression is member; otherwise, false.

View Source IsMethod(Expression)

Determines whether the specified expression is a method.

Declaration

public static bool IsMethod(Expression expression)

Parameters Type Name Description System.Linq.Expressions.Expression expression

The expression.

Returns Type Description System.Boolean

true if the specified expression is method; otherwise, false.

View Source IsMethodSignatureEqualTo(MethodInfo, MethodInfo)

Determines whether the MethodInfo is the same based on signature, not based on the equality operator or HashCode.

Declaration

public static bool IsMethodSignatureEqualTo(this MethodInfo left, MethodInfo right)

Parameters Type Name Description System.Reflection.MethodInfo left

The left.

System.Reflection.MethodInfo right

The right.

Returns Type Description System.Boolean

true if [is method signature equal to] [the specified left]; otherwise, false.

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