检查值在GridView控件

Question

反复会是一个什么逻辑来检查，如果输入的GridView屡禁不止？[https://i.stack.imgur.com/rZ7Yv.png]

Answer 1

private bool DuplicateExist() 
     { 
      var existingValues = dataGridView1.Rows 
            .OfType<DataGridViewRow>() 
            .Where(x => x.Cells["Bar Code"].Value != null) 
            .Select(x => x.Cells["Bar Code"].Value.ToString()) 
      return (existingValues.Count != existingValues.Distinct().Count()) 
     } 

这能否帮助你？

Answer 2

你也可以像下面这样做在一个查询：

 dataGridView1.Rows.Add("254"); 
     dataGridView1.Rows.Add("124"); 
     dataGridView1.Rows.Add("543"); 
     dataGridView1.Rows.Add("234"); 
     dataGridView1.Rows.Add("254"); 

     bool anyDuplicated = dataGridView1.Rows 
      .OfType<DataGridViewRow>() 
      .Where(x => x.Cells["Column1"].Value != null) 
      .Select(x => x.Cells["Column1"].Value.ToString()) 
      .GroupBy(x => x) 
      .Where(g => g.Count() > 1) 
      .Select(g => g.Key) 
      .Any();