/// <summary>
/// 将对象属性转换为key-value对
/// </summary>
/// <param name="obj">对象</param>
/// <returns>字典</returns>
private static Dictionary <string, string> ToMap <T>(T obj)
{
Dictionary <string, string> result = new Dictionary <string, string>();
Type t = typeof(T);
foreach (PropertyInfo property in t.GetProperties(BindingFlags.Public | BindingFlags.Instance))
{
string name = property.Name;
DynamicExpressionAttribute dynamicExpressionAttribute = CustomAttributeExtension <DynamicExpressionAttribute> .GetCustomAttributeValue(t, property);
string key = dynamicExpressionAttribute.Name ?? name;
var val = property.GetValue(obj);
string value;
if (dynamicExpressionAttribute.IsDynamicExpression)
{
if (!string.IsNullOrWhiteSpace(dynamicExpressionAttribute.Operator))
{
if (dynamicExpressionAttribute.Operator == "yyyy-MM-dd")
{
if (val != null)
{
value = Convert.ToDateTime(val).ToString(dynamicExpressionAttribute.Operator);
}
else
{
value = null;
}
}
else
{
value = val?.ToString();
}
}
else
{
value = val?.ToString();
}
}
else
{
value = val.SerializeObject();
}
if (value != null)
{
result.Add(key, value);
}
}
if (result.Count <= 0)
{
var str = obj.SerializeObject();
string pattern = "(\"(?<key>[^,^\"]+)\":\"(?<value>[^:^\"]+)\")|(\"(?<key>[^,^\"]+)\":(?<value>[\\d\\.]+))";
Regex regex = new Regex(pattern);
var match = regex.Matches(str);
foreach (Match item in match)
{
var key = item.Groups["key"].ToString();
var value = item.Groups["value"].ToString();
result.Add(key, value);
}
}
return(result);
}
/// <summary>
/// 获取动态表达式
/// </summary>
/// <typeparam name="TResult">表达式数据类型</typeparam>
/// <typeparam name="TCondition">表达式条件类型</typeparam>
/// <param name="data">数据</param>
/// <param name="condtion">条件</param>
/// <returns>表达式</returns>
public static Expression <Func <TResult, bool> > GetDynamicExpression <TResult, TCondition>(this IEnumerable <TResult> data, TCondition condtion)
where TResult : class
where TCondition : class
{
Type tConditionType = typeof(TCondition);
Type tResultType = typeof(TResult);
Expression totalExpr = Expression.Constant(true);
ParameterExpression param = Expression.Parameter(typeof(TResult), "n");
foreach (PropertyInfo property in tConditionType.GetProperties())
{
string key = property.Name;
object value = property.GetValue(condtion);
if (value != null && value.ToString() != string.Empty)
{
DynamicExpressionAttribute dynamicExpressionAttribute = CustomAttributeExtension <DynamicExpressionAttribute> .GetCustomAttributeValue(tConditionType, property);
//等式左边的值
string name = dynamicExpressionAttribute.Name ?? key;
Expression left = Expression.Property(param, tResultType.GetProperty(name));
//等式右边的值
Expression right = Expression.Constant(value);
Expression filter;
switch (dynamicExpressionAttribute.Operator)
{
case "!=":
filter = Expression.NotEqual(left, right);
break;
case ">":
filter = Expression.GreaterThan(left, right);
break;
case ">=":
filter = Expression.GreaterThanOrEqual(left, right);
break;
case "<":
filter = Expression.LessThan(left, right);
break;
case "<=":
filter = Expression.LessThanOrEqual(left, right);
break;
case "Contains":
filter = Expression.Call(Expression.Property(param, tResultType.GetProperty(name)), typeof(string).GetMethod("Contains", new [] { typeof(string) }), Expression.Constant(value));
break;
default:
filter = Expression.Equal(left, right);
break;
}
totalExpr = Expression.And(filter, totalExpr);
}
}
var predicate = Expression.Lambda(totalExpr, param);
//var dynamic = (Func<TResult, bool>)predicate.Compile();
var dynamic = (Expression <Func <TResult, bool> >)predicate;
return(dynamic);
}
