参考链接:https://www.cnblogs.com/jiangshuai52511/p/8079059.html
单个列:
DataView dv = new DataView(dt);
dt = dv.ToTable(true, “Id”);
多个列:
DataView dv = new DataView(dt);
dt = dv.ToTable(true, new string[] { “Id”,”Value” });
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