abp-next-admin/aspnet-core/framework/dynamic-queryable/LINGYUN.Linq.Dynamic.Queryable/README.EN.md

LINGYUN.Linq.Dynamic.Queryable

A basic library for dynamic querying, extending Linq to dynamically build expression trees.

Features

• Support for dynamic query condition building
• Support for various comparison operators: equal, not equal, greater than, less than, greater than or equal, less than or equal, contains, not contains, starts with, not starts with, ends with, not ends with, etc.
• Support for dynamic type conversion and null value handling
• Support for dynamic querying of enum types

Configuration and Usage

The module can be referenced as needed, providing extensions only for Linq.

Basic Usage

// Create dynamic query parameter
var parameter = new DynamicParamter 
{
    Field = "Name",
    Comparison = DynamicComparison.Equal,
    Value = "test"
};

// Create query condition
var queryable = new DynamicQueryable
{
    Paramters = new List<DynamicParamter> { parameter }
};

// Apply to Expression
Expression<Func<TEntity, bool>> condition = e => true;
condition = condition.DynamicQuery(queryable);

// Query using the condition
var result = await repository.Where(condition).ToListAsync();

Supported Comparison Operators

• Equal - Equals
• NotEqual - Not equals
• LessThan - Less than
• LessThanOrEqual - Less than or equal to
• GreaterThan - Greater than
• GreaterThanOrEqual - Greater than or equal to
• Contains - Contains
• NotContains - Does not contain
• StartsWith - Starts with
• NotStartsWith - Does not start with
• EndsWith - Ends with
• NotEndsWith - Does not end with

Related Links

• LINGYUN.Abp.Dynamic.Queryable.Application