从特定列获取数据表中的行索引 [英] Get row index in datatable from a certain column

问题描述

| 1 | 2 | 3 |
+------------+
| A | B | C |
| D | E | F | 
| G | H | I |

---

System.Data.DataTable dt = new DataTable();

dt.Columns.Add("1");
dt.Columns.Add("2");
dt.Columns.Add("3");
dt.Rows.Add(new object[] { "A", "B", "C" });
dt.Rows.Add(new object[] { "D", "E", "F" });
dt.Rows.Add(new object[] { "G", "H", "I" });

int? index = null;

var rows = new System.Data.DataView(dt).ToTable(false, new[] {"1"}).Rows;

for (var i = 0; i < rows.Count; i++)
{
    if (rows[i].ItemArray.FirstOrDefault() as string == "A")
        index = i;
}

是否有任何方法可以简化此代码以获取提供的列的特定行的索引?在这种情况下，索引将为 0 ，因为我要遍历第一列，直到找到"A"为止.感觉应该对此有一个linq解决方案，但我无法弄清楚.

Is there any way to simplify this code for fetching the index of a certain row, with a column provided? In this case, index will be 0, since I'm iterating through the first column until i find "A". Feels like there should be a linq solution to this, but I can't figure it out.

推荐答案

如果使用 List< T> .FindIndex 确定给定谓词的索引:

If you use the DataTableExtensions.AsEnumerable() method, you will be able to query your DataTable with LINQ. You can then use List<T>.FindIndex to determine the index of a given predicate:

int? index = new System.Data.DataView(dt).ToTable(false, new[] { "1" })
                .AsEnumerable()
                .Select(row => row.Field<string>("1")) // ie. project the col(s) needed
                .ToList()
                .FindIndex(col => col == "G"); // returns 2

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