本文介绍了具有所有数据类型的C#LINQ动态选择的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正在使用动态LINQ来实现搜索,其中查询在运行时获取列名和搜索值.这样,我需要根据列类型解析数据-
I am implementing search by using dynamic LINQ, where the query gets column name and search value in runtime. In this way, I need to parse the data according to the column type-
if (isNumeric) { int x = Int32.Parse(txtHistorySearch.Text); truncatedData = ((IQueryable<object>)rawData).Where(columnName + "=@0", x).ToList(); } else if (DateTime.TryParse(txtHistorySearch.Text, out temp)) { var parsedDt = DateTime.Parse(txtHistorySearch.Text); var nextDay = parsedDt.AddDays(1); truncatedData = ((IQueryable<object>)rawData).Where(columnName + ">= @0 && " + columnName + " < @1", parsedDt, nextDay).ToList(); } else { truncatedData = ((IQueryable<object>)rawData).Where(columnName + "=@0", searchValue).ToList(); }可以使用单个where子句为所有数据类型完成此操作吗?
Can this be done for all data types using single where clause?
推荐答案您可以使用表达式树来做到这一点.
You can do this using expression trees.
msdn.microsoft/en-us/library/bb397951.aspx
msdn.microsoft/en-us/library/bb882637.aspx
更多推荐
具有所有数据类型的C#LINQ动态选择
发布评论