/// <summary>
/// 生成树形 JSON 数据
/// </summary>
/// <typeparam name="T">实体类型</typeparam>
/// <param name="dataList">数据列表</param>
/// <param name="maxLength">最大编号长度，为 0 程序自动生成</param>
/// <param name="rootID">根节点 ID</param>
/// <param name="jsonTemplate">Json 模板，例：{ id:1, name:"name" }</param>
/// <returns></returns>
public static string ToJson <T>(List <T> dataList, int maxLength = 0, string rootID = "0", ITreeJsonTemplate <T> jsonTemplate = null) where T : ITreeData
{
if (dataList == null || dataList.Count == 0)
{
return("{}");
}
List <TreeNode <T> > nodeList = ToTree <T>(dataList, maxLength, rootID, jsonTemplate);
if (nodeList == null || nodeList.Count == 0)
{
return("{}");
}
StringBuilder stringBuilder = new StringBuilder();
stringBuilder.Append("[");
int index = 0;
foreach (TreeNode <T> nodeItem in nodeList)
{
stringBuilder.Append(nodeItem.JsonText);
if (index < nodeList.Count - 1)
{
stringBuilder.Append(",");
}
index++;
}
stringBuilder.Append("]");
return(stringBuilder.ToString());
}
/// <summary>
/// 获取树形数据
/// </summary>
/// <typeparam name="T">实体类型</typeparam>
/// <param name="dataList">数据列表</param>
/// <param name="maxLength">最大编号长度，大于 0 程序自动生成</param>
/// <param name="rootID">根节点 ID</param>
/// <param name="jsonTemplate">模板</param>
/// <param name="layerNameSplitChar">分隔符，例：/</param>
/// <param name="layerIDSplitChar">分隔符，例：/</param>
/// <returns></returns>
public static List <TreeNode <T> > ToTree <T>(List <T> dataList, int maxLength = 0, string rootID = "0", ITreeJsonTemplate <T> jsonTemplate = null, string layerNameSplitChar = "/", string layerIDSplitChar = ",") where T : ITreeData
{
#region 设置排序序号
if (maxLength > 0)
{
foreach (T t in dataList)
{
t.TreeUniqueIdentity = long.Parse(string.Format(TreeUniqueIdentityFormat, t.TreeParentID.PadLeft(maxLength, '0'), t.TreeID.PadLeft(maxLength, '0')));
}
}
#endregion
#region 根据排序序号排序
dataList.Sort((x, y) =>
{
return((int)(x.TreeUniqueIdentity - y.TreeUniqueIdentity));
});
#endregion
TreeNode <T> treeNode = null;
List <TreeNode <T> > nodeList = new List <TreeNode <T> >();
Dictionary <string, TreeNode <T> > nodeDict = new Dictionary <string, TreeNode <T> >();
foreach (T t in dataList)
{
// 设置根数据
if (t.TreeParentID == rootID)
{
treeNode = new TreeNode <T>()
{
Data = t, NodeList = new List <TreeNode <T> >(), LayerIndex = 1, IJsonTemplate = jsonTemplate, LayerID = t.TreeID, LayerName = t.TreeName
};
nodeList.Add(treeNode);
nodeDict.Add(t.TreeID, treeNode);
}
else
{
if (nodeDict.ContainsKey(t.TreeParentID))
{
treeNode = new TreeNode <T>()
{
Data = t, NodeList = new List <TreeNode <T> >(), LayerIndex = nodeDict[t.TreeParentID].LayerIndex + 1, IJsonTemplate = jsonTemplate, LayerID = string.Format("{0}{1}{2}", nodeDict[t.TreeParentID].LayerID, layerIDSplitChar, t.TreeID), LayerName = string.Format("{0}{1}{2}", nodeDict[t.TreeParentID].LayerName, layerNameSplitChar, t.TreeName)
};
treeNode.ParentNode = nodeDict[t.TreeParentID];
treeNode.ParentNode.NodeList.Add(treeNode);
nodeDict.Add(t.TreeID, treeNode);
}
}
}
return(nodeList);
}