EntityToExpression.cs
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using System;
using System.Collections.Generic;
using System.Linq.Expressions;
using System.Reflection;
namespace Hh.Mes.Common.Infrastructure
{
public static class EntityToExpression<T>
{
public static Expression<Func<T, bool>> GetExpressions(T t)
{
ParameterExpression u = Expression.Parameter(typeof(T), "u");
Filter filterObj = new Filter();
filterObj.Key = "";
filterObj.Value = "";
// 获得此模型的类型
Type type = typeof(T);
Expression result = Expression.Constant(true);
// 获得此模型的公共属性
PropertyInfo[] propertys = t.GetType().GetProperties();
for (int i = 0; i < propertys.Length; i++)
{
dynamic value2 = propertys[i].GetValue(t, null);
if (value2 != null && value2.ToString() != "" )
{
if (propertys[i].PropertyType.Name.Equals("List`1")|| propertys[i].PropertyType.Name.Equals("Guid"))
{
break;
}
filterObj.Key = propertys[i].Name.ToString();
if (propertys[i].PropertyType == typeof(DateTime) || propertys[i].PropertyType == typeof(DateTime?))
{
filterObj.Value = ((DateTime)propertys[i].GetValue(t, null)).ToString("yyyy-MM-dd HH:mm:ss.fff");
}
else
{
filterObj.Value = propertys[i].GetValue(t, null).ToString();
}
if ((propertys[i].PropertyType == typeof(int) || propertys[i].PropertyType == typeof(int?))
|| (propertys[i].PropertyType == typeof(short) || propertys[i].PropertyType == typeof(short?))
|| (propertys[i].PropertyType == typeof(long) || propertys[i].PropertyType == typeof(long?))
|| (propertys[i].PropertyType == typeof(decimal) || propertys[i].PropertyType == typeof(decimal?))
|| (propertys[i].PropertyType == typeof(double) || propertys[i].PropertyType == typeof(double?))
|| (propertys[i].PropertyType == typeof(bool) || propertys[i].PropertyType == typeof(bool?))
)
{
filterObj.Contrast = ConvertOperString("eq");
filterObj.JqContrast = "eq";
if (propertys[i].PropertyType == typeof(int?) ||
propertys[i].PropertyType == typeof(short?) ||
propertys[i].PropertyType == typeof(long?) ||
propertys[i].PropertyType == typeof(double?) ||
propertys[i].PropertyType == typeof(bool?)
)
{
PropertyInfo property = typeof(T).GetProperty(filterObj.Key);
Expression left = Expression.Property(u, property);
try
{
result = result.AndAlso(Expression.Property(left, "HasValue"));
}
catch (Exception ex)
{
throw ex;
}
}
}
else
{
filterObj.Contrast = ConvertOperString("cn");
filterObj.JqContrast = "cn";
}
result = result.AndAlso(u.GenerateBody<T>(filterObj));
}
}
Expression<Func<T, bool>> expression = u.GenerateTypeLambda<T>(result);
return expression;
}
private static string ConvertOperString(string _searchOper)
{
string sReturn = _searchOper;
switch (_searchOper)
{
case "eq"://等于
sReturn = "==";
break;
case "ne"://不等
sReturn = "!=";
break;
case "lt"://小于
sReturn = "<";
break;
case "le"://小于等于
sReturn = "<=";
break;
case "gt"://大于
sReturn = ">";
break;
case "ge"://大于等于
sReturn = ">=";
break;
case "bw"://开始于
sReturn = "begin with";
break;
case "bn"://不开始于
sReturn = "not begin with";
break;
case "in"://属于
sReturn = "in";
break;
case "ni"://不属于
sReturn = "not in";
break;
case "ew"://结束于
sReturn = "end with";
break;
case "en"://不结束于
sReturn = "not end with";
break;
case "cn"://包含
sReturn = "like";
break;
case "nc"://不包含
sReturn = "not like";
break;
case "nu"://为空
sReturn = "null";
break;
case "nn"://不为空
sReturn = "not null";
break;
}
return sReturn;
}
}
}