Repository/RepositoryHelpers.cs

这里只显示每个文件的开头 60 行。登录后可以解锁完整代码。

微信扫码关注公众号，代码整理好后第一时间通知你。

/*
 * Author: Kishore Reddy
 * Url: http://commonlibrarynet.codeplex.com/
 * Title: CommonLibrary.NET
 * Copyright: � 2009 Kishore Reddy
 * License: LGPL License
 * LicenseUrl: http://commonlibrarynet.codeplex.com/license
 * Description: A C# based .NET 3.5 Open-Source collection of reusable components.
 * Usage: Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Linq.Expressions;
using System.Reflection;


namespace ComLib.Entities
{
    class RepositoryExpressionHelper
    {
        /// <summary>
        /// Get the property name from the expression.
        /// e.g. GetPropertyName(Person)( p => p.FirstName);
        /// </summary>
        /// <typeparam name="T">Type of item.</typeparam>
        /// <param name="exp">Expression.</param>
        /// <returns>Property name.</returns>
        public static string GetPropertyName<T>(Expression<Func<T, object>> exp)
        {
            MemberExpression memberExpression = null;

            // Get memberexpression.
            if (exp.Body is MemberExpression) 
                memberExpression = exp.Body as MemberExpression;

            if (exp.Body is UnaryExpression)
            {
                var unaryExpression = exp.Body as UnaryExpression;
                if (unaryExpression.Operand is MemberExpression)
                    memberExpression = unaryExpression.Operand as MemberExpression;
            }
            
            if( memberExpression == null)
                throw new InvalidOperationException("Not a member access.");

            var info = memberExpression.Member as PropertyInfo;
            return info.Name;
        }


        /// <summary>
        /// Delete using the expression.
        /// e.g. entity.LogLevel == 1
        /// </summary>