这篇文章主要介绍了C#递归应用之如何实现JS文件的自动引用的相关知识，内容详细易懂，操作简单快捷，具有一定借鉴价值，相信大家阅读完这篇C#递归应用之如何实现JS文件的自动引用文章都会有所收获，下面我们一起来看看吧。
背景
两张表，分别是 ：sys_tbl,和 sys_field,其中：sys_tbl 是系统所有表的信息，包含两个字段 ：code（表名）,name（表描述信息）；sys_fld 是记录第张表中的字段 的名称（field)和描述信息（table) ,
截图如下：
sys_tbl
其中，字段 名称包含对其它名称（对象） 的引用，写法为：表名（去除下划线）_引用字段 ，如：einventory_cinvcode,就是对表 e_inventory 中字段 cinvcode的引用。
每张表都在系统 中对应有不同功能的js文件（模块）如： 编辑窗体（dialog类型)，跨域选择窗体(field）类型等
需求
在一个综合的页面中，会对其它对象进行引用（依赖)，而这种引用最终体现在对js文件的包含。同时被引用的js 文件（一级引用）还有自已关联对象（二级引用）.....如此下去，直到N 级引用。
所以现在需要逐层找到对象的引用，直到最后不依赖任何对象为止，并把这些js文件生成引用包含路径（不重复）
分析
1、返回结果类型
得到这些js引用，不能重复，但是对象之间引用是可以存在交叉的，在整个引用链条上，同一个对象会被 多个对象引用，所以简单的字符串数组是避免不了重复的。但是在C#中的HashSet可以做到不重复，同时这个去重工作是自动完成的，所以存结果如果是简单的value类型，用 HashSet就可以，但是因为字段中表的信息已经被格式化过，所以还要把格式化之前的表名称取出与字段对应，所以需要一个key-value类型的数据 ，那就是 Dictionary<string, string> 了。
2、算法选择
因为查找引用，是层层进行的，而且下一层引用的要用到上一层的引用结果，所以这里选择递归算法
代码实现
声明一个全局变量，记录所有的表与字段的对应的数据，因为需要确保数据key 唯一性所以选择Dicctionary类型
/// <summary> /// define the gloable parameter to save the rel obj data /// </summary> public static Dictionary<string, string> <strong>deepRef </strong>= new Dictionary<string, string>();
入口函数，完成准备工作，（数据库连接，参数准备）
/// <summary>
/// 通过表的字段 获取相关的引用字段依赖的对象 直到没有依赖为止
/// </summary>
/// <param name="headField">表字段列表</param>
/// <returns></returns>
public static Dictionary<string,string> getRelRef(List<IniItemsTableItem> headField)
{
HashSet<string> refset = new HashSet<string>();
// HashSet<string> refset_result = new HashSet<string>();
foreach (var item in headField)
{
if (!item.controlType.StartsWith("hz_"))// is not the field of reference
{
continue;
}
string[] fieldarr = item.dataIndex.Split('_');//the constructor is :[tabble]_[field]
refset.Add(fieldarr[0]);//the first prefix
}
dataOperate dao = new dataOperate();
dao.DBServer = "info";
SqlConnection conn = dao.createCon();
try
{
if (refset.Count > 0)
{
if (conn.State != ConnectionState.Open)
conn.Open();//open connection
deepRef = new Dictionary<string, string>();//clear the relation obj data
getRef(conn, refset);
}
return deepRef;
}
catch (Exception)
{
throw;
}
finally
{
if (conn.State == ConnectionState.Open)
conn.Close();
}
}递归函数，最终完成在数据库中获取字段依赖的对象的获取
/// <summary>
/// get the relation obj
/// </summary>
/// <param name="conn"></param>
/// <param name="ref_field"></param>
/// <returns></returns>
public static HashSet<string> <strong>getRef</strong>(SqlConnection conn, HashSet<string> ref_field)
{
HashSet<string> refset = new HashSet<string>();
string refstr = string.Join("','", ref_field);
if (refstr != "")
{
refstr = "'" + refstr + "'";
string sql = "SELECT dbo.GetSplitOfIndex(b.[field],'_',1) as refcode,a.[code] FROM ( select replace(code,'_','') as uncode,* from [SevenWOLDev].[dbo].[sys_tbl_view] ) as a inner join [SevenWOLDev].[dbo].[sys_fld_view] as b on a.uncode=dbo.GetSplitOfIndex(b.[field],'_',1) where replace([table],'_','') in (" + refstr + ") and uitype='ref'";
//get dataset relation obj
DataSet ds = dataOperate.getDataset(conn, sql);
if (ds != null && ds.Tables.Count > 0)
{
DataTable dt = ds.Tables[0];
if (dt.Rows.Count > 0)
{
//rel ref exists
for (int k = 0; k < dt.Rows.Count; k++)
{
string vt = dt.Rows[k].ItemArray[0].ToString();
string vv = dt.Rows[k].ItemArray[1].ToString();
refset.Add(vt);//save current ref
if(!<strong>deepRef</strong>.ContainsKey(vt))
<strong>deepRef</strong>.Add(vt, vv);// save all ref
}
if (refset.Count > 0)// get the ref successfully
{
//recursion get
getRef(conn, refset);
}
}
}
}
else
{
//no ref
}
return refset;
}对函数进行调用，并组织出js文件引用路径
Dictionary<string,string> deepRef = ExtjsFun.getRelRef(HeadfieldSetup);
if (deepRef != null)
{
foreach (var s in deepRef)
{
string tem_module = "";
tem_module = s.Value;
string[] moduleArr = tem_module.Split('_');
if (tem_module.IndexOf("_") >= 0)
tem_module = moduleArr[1];//module name for instance: p_machine ,the module is “machine” unless not included the underscore
string fieldkind = "dialog";
jslist.Add(MyComm.getFirstUp(tem_module) + "/" + ExtjsFun.GetJsModuleName(tem_module, s.Value, fieldkind) + ".js");
fieldkind = "field";
jslist.Add(MyComm.getFirstUp(tem_module) + "/" + ExtjsFun.GetJsModuleName(tem_module, s.Value, fieldkind) + ".js");
}
}最终结果 如下：
<script src="../../dept/demoApp/scripts/Sprice/SpriceE_spriceGridfield.js" type="text/javascript"></script> <script src="../../dept/demoApp/scripts/Org/OrgE_orgDialog.js" type="text/javascript"></script> <script src="../../dept/demoApp/scripts/Supplier/SupplierOa_supplierDialog.js" type="text/javascript"></script> <script src="../../dept/demoApp/scripts/Supplier/SupplierOa_supplierField.js" type="text/javascript"></script> <script src="../../dept/demoApp/scripts/Unit/UnitE_unitDialog.js" type="text/javascript"></script> <script src="../../dept/demoApp/scripts/Unit/UnitE_unitField.js" type="text/javascript"></script> <script src="../../dept/demoApp/scripts/Wh/WhWh_whDialog.js" type="text/javascript"></script> <script src="../../dept/demoApp/scripts/Wh/WhWh_whField.js" type="text/javascript"></script> <script src="../../dept/demoApp/scripts/Mold/MoldP_moldDialog.js" type="text/javascript"></script> <script src="../../dept/demoApp/scripts/Mold/MoldP_moldField.js" type="text/javascript"></script> <script src="../../dept/demoApp/scripts/Suppliercategory/SuppliercategoryOa_suppliercategoryDialog.js" type="text/javascript"></script> <script src="../../dept/demoApp/scripts/Suppliercategory/SuppliercategoryOa_suppliercategoryField.js" type="text/javascript"></script> <script src="../../dept/demoApp/scripts/Bank/BankOa_bankDialog.js" type="text/javascript"></script> <script src="../../dept/demoApp/scripts/Bank/BankOa_bankField.js" type="text/javascript"></script> <script src="../../dept/demoApp/scripts/Machine/MachineP_machineDialog.js" type="text/javascript"></script> <script src="../../dept/demoApp/scripts/Machine/MachineP_machineField.js" type="text/javascript"></script> <script src="../../dept/demoApp/scripts/Inventory/InventoryE_inventoryDialog.js" type="text/javascript"></script> <script src="../../dept/demoApp/scripts/Basedocment/BasedocmentOa_basedocmentDialog.js" type="text/javascript"></script> <script src="../../dept/demoApp/scripts/Basedocment/BasedocmentOa_basedocmentField.js" type="text/javascript"></script> <script src="../../dept/demoApp/scripts/Basedoctype/BasedoctypeOa_basedoctypeDialog.js" type="text/javascript"></script> <script src="../../dept/demoApp/scripts/Basedoctype/BasedoctypeOa_basedoctypeField.js" type="text/javascript"></script> <script src="../../dept/demoApp/scripts/Tax/TaxE_taxDialog.js" type="text/javascript"></script> <script src="../../dept/demoApp/scripts/Tax/TaxE_taxField.js" type="text/javascript"></script>
完事代码如下：
/// <summary>
/// define the gloable parameter to save the rel obj data
/// </summary>
public static Dictionary<string, string> deepRef = new Dictionary<string, string>();
/// <summary>
/// 通过表的字段 获取相关的引用字段依赖的对象 直到没有依赖为止
/// </summary>
/// <param name="headField">表字段列表</param>
/// <returns></returns>
public static Dictionary<string,string> getRelRef(List<IniItemsTableItem> headField)
{
HashSet<string> refset = new HashSet<string>();
// HashSet<string> refset_result = new HashSet<string>();
foreach (var item in headField)
{
if (!item.controlType.StartsWith("hz_"))// is not the field of reference
{
continue;
}
string[] fieldarr = item.dataIndex.Split('_');//the constructor is :[tabble]_[field]
refset.Add(fieldarr[0]);//the first prefix
}
dataOperate dao = new dataOperate();
dao.DBServer = "info";
SqlConnection conn = dao.createCon();
try
{
if (refset.Count > 0)
{
if (conn.State != ConnectionState.Open)
conn.Open();//open connection
deepRef = new Dictionary<string, string>();//clear the relation obj data
getRef(conn, refset);
}
return deepRef;
}
catch (Exception)
{
throw;
}
finally
{
if (conn.State == ConnectionState.Open)
conn.Close();
}
}
/// <summary>
/// get the relation obj
/// </summary>
/// <param name="conn"></param>
/// <param name="ref_field"></param>
/// <returns></returns>
public static HashSet<string> getRef(SqlConnection conn, HashSet<string> ref_field)
{
HashSet<string> refset = new HashSet<string>();
string refstr = string.Join("','", ref_field);
if (refstr != "")
{
refstr = "'" + refstr + "'";
string sql = "SELECT dbo.GetSplitOfIndex(b.[field],'_',1) as refcode,a.[code] FROM ( select replace(code,'_','') as uncode,* from [SevenWOLDev].[dbo].[sys_tbl_view] ) as a inner join [SevenWOLDev].[dbo].[sys_fld_view] as b on a.uncode=dbo.GetSplitOfIndex(b.[field],'_',1) where replace([table],'_','') in (" + refstr + ") and uitype='ref'";
//get dataset relation obj
DataSet ds = dataOperate.getDataset(conn, sql);
if (ds != null && ds.Tables.Count > 0)
{
DataTable dt = ds.Tables[0];
if (dt.Rows.Count > 0)
{
//rel ref exists
for (int k = 0; k < dt.Rows.Count; k++)
{
string vt = dt.Rows[k].ItemArray[0].ToString();
string vv = dt.Rows[k].ItemArray[1].ToString();
refset.Add(vt);//save current ref
if(!deepRef.ContainsKey(vt))
deepRef.Add(vt, vv);// save all ref
}
if (refset.Count > 0)// get the ref successfully
{
//recursion get
getRef(conn, refset);
}
}
}
}
else
{
//no ref
}
return refset;
}