FlowPortal-BPM——功能：判断数据库表中字段是否重复并阻止提交或保存

<%@ WebHandler Language="C#" Class="CollectionManagement" %>

using System;
using System.Web;
using System.Linq;
using System.Collections.Generic;
using System.Collections;

public class CollectionManagement : IHttpHandler {

public void ProcessRequest (HttpContext context) {

string PID=context.Request["PID"];
//PID = "GC422444";
//string json = "{\"P\":\"F\"}";
string flag = "true";
using (CollectionManagementDataClassesDataContext cm = new CollectionManagementDataClassesDataContext())
{
List<EngineeringManagement> P = cm.EngineeringManagement.Where(r => r.ProjectID == PID).ToList();
if (P.Count != 0)
{
flag = "false";
}
}

context.Response.Write(flag);
context.Response.End();
}

public bool IsReusable
{
get
{
return false;
}
}

}