vb.net - 如何避免在 vb.net 的组合框中出现重复

Question

如何避免在组合框中重复？

我有 3 个组合框，我希望用户可以添加或从现有值中选择，但是当我选择现有项目之一时，它会复制该项目

With something
   .DataSource = empBindingsource 
   .DisplayMember = "Employer_Name" 
   .ValueMember = "Employer_ID" 
   .DataBindings.Add("selectedValue", job_VacanciesBindingsource, "Employer_ID", False, DataSourceUpdateMode.OnValidation) 
End With 

With cboDesc 
   .DataSource = descDataset.Tables("Job_Vacancies").Copy 
   .DisplayMember = "Job_Description" ' 
   .ValueMember = "Job_ID" 
   .DataBindings.Add("text", job_VacanciesBindingsource, "Job_Description", False, DataSourceUpdateMode.OnValidation) 
End With

Answer 1

你的问题不是很清楚，但你可以试试：

.DataSource = descDataset.Tables("Job_Vacancies").Copy.Distinct()