result = source.Where(p => p.Code.Contains(code));if(string.IsNullOrEmpty(address) ==false) result = source.Where(p => p.Code.Contains(address));returnresult; } 以上代码有大量的 if 显得很繁琐,代码可读性不好。 二、创建并使用
官方的Linq中并没有WhereIf方法,为了方便我们的日常开发,使用扩展方法实现WhereIf。 publicstaticclassQueryableExtensions {publicstaticIQueryable<T> WhereIf<T>(thisIQueryable<T> query,boolcondition, Expression<Func<T,bool>>predicate) {returncondition ?query.Where(predicate) : query; }publicstaticIQueryable...
WhereIf不是必需要的,你自也可扩展3、WhereIf第一个出现的ORM是sqlsugar , 而现在sqlsugar不光有where...
aIf the original curve has corner points, where the derivative is not defined, the problem of determining the intersection of propagating lines arises (see Fig. 1a,the ambiguity at the singular point produces two normals). In case of expansion of the corner point, the insertion of an addition...
public static class QueryableExtensions { public static IQueryable<T> WhereIf<T>(this IQueryable<T> query, bool condition, Expression<Func<T, bool>> predicate) { return condition ? query.Where(predicate) : query; } public staWhereIf 扩展 public static class QueryableExtensions { public static...
2、WhereIf不是必需要的,你自也可扩展 3、WhereIf第一个出现的ORM是sqlsugar, 而现在sqlsugar不光有...
ABP Linq 扩展的 WhereIf 查询内部实现 public static class QueryableExtensions { public static IQueryable<T> WhereIf<T>(this IQueryable<T> query, bool condition, Expression<Func<T, bool>> predicate) { return condition ? query.Where(predicate) : query; } public static IQueryable<T> WhereIf<...
WhereIf 扩展比较简单,代码如下: publicstaticIQueryable<T> WhereIf<T>(thisIQueryable<T> source, Expression<Func<T,bool>> predicate,boolcondition) {returncondition ? source.Where(predicate) : source; } 上面的代码可简化成: publicIQueryable<Person> Query(IQueryable<Person> source,stringname,stringco...
WhereIf 扩展比较简单,代码如下: publicstaticIQueryable<T> WhereIf<T>(thisIQueryable<T> source, Expression<Func<T,bool>> predicate,boolcondition) {returncondition ? source.Where(predicate) : source; } 上面的代码可简化成: publicIQueryable<Person> Query(IQueryable<Person> source,stringname,stringco...