| | | 1 | | using System; |
| | | 2 | | using System.Linq.Expressions; |
| | | 3 | | |
| | | 4 | | namespace Plainquire.Filter; |
| | | 5 | | |
| | | 6 | | /// <summary> |
| | | 7 | | /// Extension methods for <see cref="Expression"/>. |
| | | 8 | | /// </summary> |
| | | 9 | | internal static class ExpressionExtensions |
| | | 10 | | { |
| | | 11 | | /// <summary> |
| | | 12 | | /// Gets the name of a first level property. |
| | | 13 | | /// </summary> |
| | | 14 | | /// <typeparam name="TEntity">The type of the class that declares <typeparamref name="TProperty"/>.</typeparam> |
| | | 15 | | /// <typeparam name="TProperty">The type of the property.</typeparam> |
| | | 16 | | /// <param name="property">The property to get the name for.</param> |
| | | 17 | | /// <exception cref="ArgumentException">Given property must be a first level property access expression like person |
| | | 18 | | public static string GetPropertyName<TEntity, TProperty>(this Expression<Func<TEntity, TProperty>> property) |
| | | 19 | | { |
| | 10212 | 20 | | var body = UnboxBody(property); |
| | | 21 | | |
| | 10212 | 22 | | if (body is not MemberExpression { Expression: ParameterExpression } memberExpression) |
| | 1 | 23 | | throw new ArgumentException("Given property must be a first level property access expression like person => |
| | | 24 | | |
| | 10211 | 25 | | return memberExpression.Member.Name; |
| | | 26 | | } |
| | | 27 | | |
| | | 28 | | private static Expression UnboxBody<TEntity, TProperty>(this Expression<Func<TEntity, TProperty>> property) |
| | | 29 | | { |
| | 10212 | 30 | | if (property.Body is UnaryExpression { NodeType: ExpressionType.Convert } convert) |
| | 0 | 31 | | return convert.Operand; |
| | 10212 | 32 | | return property.Body; |
| | | 33 | | } |
| | | 34 | | } |