代码语言:csharp 复制 varquery=fromitemindataTable.AsEnumerable()selectnewstring[]{item.Field<string>("Column1"),item.Field<string>("Column2")}; 使用Select方法将两列结果合并为一个数组,并将结果存储在List中: 代码语言:csharp 复制 List<string
// The following query performs two steps: // 1) use Split to break each row (a string) into an array // of strings, // 2) convert the element at position examNum to an int // and select it. var columnQuery = from line in strs let elements = line.Split(',') s...
IsPrimaryKey = true)] public int Id { get; set; } [Column(Name = "name")] ...
Cells["Column1"].Value.ToString().Contains(searchText) select row; // 将查询结果应用于DataGridView控件 dataGridView1.DataSource = query.CopyToDataTable(); } } } 在这个示例中,我们首先获取搜索文本,然后使用LINQ查询从DataGridView控件的行中筛选出包含搜索文本的单元格数据。最后,我们将查询结果应用于...
// 1) use Split to break each row (a string) into an array// of strings,// 2) convert the element at position examNum to an int// and select it.varcolumnQuery =fromlineinstrsletelements = line.Split(',')selectConvert.ToInt32(elements[examNum]);// Execute the quer...
// 1) use Split to break each row (a string) into an array// of strings,// 2) convert the element at position examNum to an int// and select it.varcolumnQuery =fromlineinstrsletelements = line.Split(',')selectConvert.ToInt32(elements[examNum]);// Execute the query ...
[Column]publicstringName; } classTest {staticvoidMain() { DataContext dataContext=newDataContext ("connection string"); Table<Customer> customers = dataContext.GetTable <Customer>(); IQueryable<string> query =fromcincustomerswherec.Name.Contains ("a")orderbyc.Name.Lengthselectc.Name.ToUpper()...
现在,我们可以创建LINQ query来查询包含字母”a”的Employee了: [Table] publicclassCustomer { [Column(IsPrimaryKey =true)] publicintID; [Column] publicstringName; } classTest { staticvoidMain() { DataContext dataContext =newDataContext("connection string"); ...
In the select clause, each new Student object is initialized from the data in the two sources. If you don't have to store the results of a query, tuples or anonymous types can be more convenient than named types. The following example executes the same task as the previous example, but...
In the select clause, each new Student object is initialized from the data in the two sources. If you don't have to store the results of a query, tuples or anonymous types can be more convenient than named types. The following example executes the same task as the previous example, but...