[C#] 取得 Request URL 的方法

前言

解析 Request URL 時會進行一些判斷來擷取字串，早期常見到會利用 Substring 和 IndexOf

以 https://localhost:44339/Home/Test?id=123#topic 為例：

Request.Url.PathAndQuery.Substring(1, Request.Url.PathAndQuery.IndexOf("/", 1) - 1);
// <https://localhost/Home/Test> 中取得 Home

方法

實際上 Request 有很多 Property 可以更簡便的取得網址的各個片段

列出幾個常用的屬性，方便日後查詢：

Property	Result
Request.ApplicationPath	/
Request.PhysicalPath	C:\Code\WebApplication1\Home\Test
System.IO.Path.GetDirectoryName(Request.PhysicalPath)	C:\Code\WebApplication1\Home
Request.PhysicalApplicationPath	C:\Code\WebApplication1\
System.IO.Path.GetFileName(Request.PhysicalPath)	Test
Request.CurrentExecutionFilePath	/Home/Test
Request.FilePath	/Home/Test
Request.Path	/Home/Test
Request.RawUrl	/Home/Test?id=123
Request.Url.AbsolutePath	/Home/Test
Request.Url.AbsoluteUri	https://localhost:44339/Home/Test?id=123
Request.Url.Scheme	https
Request.Url.Host	localhost
Request.Url.Port	44339
Request.Url.Authority	localhost:44339
Request.Url.LocalPath	/Home/Test
Request.PathInfo
Request.Url.PathAndQuery	/Home/Test?id=123
Request.Url.Query	?id=123
Request.Url.Fragment
Request.Url.Segments[1].Replace(” / “, “”)	Home

上列表格參考的程式碼：

DataTable dt = new DataTable();
// <https://localhost:44339/Home/Test?id=123#topic>
// Request.Url.Segments[1].Replace("/", "");

// Request.ApplicationPath
dt.Columns.Add("Property", typeof(string));
dt.Columns.Add("Result", typeof(string));

DataRow dr = dt.NewRow();
dr[0] = "Request.ApplicationPath";
dr[1] = Request.ApplicationPath;
dt.Rows.Add(dr);

dr = dt.NewRow();
dr[0] = "Request.PhysicalPath";
dr[1] = Request.PhysicalPath;
dt.Rows.Add(dr);

dr = dt.NewRow();
dr[0] = "System.IO.Path.GetDirectoryName(Request.PhysicalPath)";
dr[1] = System.IO.Path.GetDirectoryName(Request.PhysicalPath);
dt.Rows.Add(dr);

dr = dt.NewRow();
dr[0] = "Request.PhysicalApplicationPath";
dr[1] = Request.PhysicalApplicationPath;
dt.Rows.Add(dr);

dr = dt.NewRow();
dr[0] = "System.IO.Path.GetFileName(Request.PhysicalPath)";
dr[1] = System.IO.Path.GetFileName(Request.PhysicalPath);
dt.Rows.Add(dr);

dr = dt.NewRow();
dr[0] = "Request.CurrentExecutionFilePath";
dr[1] = Request.CurrentExecutionFilePath;
dt.Rows.Add(dr);

dr = dt.NewRow();
dr[0] = "Request.FilePath";
dr[1] = Request.FilePath;
dt.Rows.Add(dr);

dr = dt.NewRow();
dr[0] = "Request.Path";
dr[1] = Request.Path;
dt.Rows.Add(dr);

dr = dt.NewRow();
dr[0] = "Request.RawUrl";
dr[1] = Request.RawUrl;
dt.Rows.Add(dr);

dr = dt.NewRow();
dr[0] = "Request.Url.AbsolutePath";
dr[1] = Request.Url.AbsolutePath;
dt.Rows.Add(dr);

dr = dt.NewRow();
dr[0] = "Request.Url.AbsoluteUri";
dr[1] = Request.Url.AbsoluteUri;
dt.Rows.Add(dr);

dr = dt.NewRow();
dr[0] = "Request.Url.Scheme";
dr[1] = Request.Url.Scheme;
dt.Rows.Add(dr);

dr = dt.NewRow();
dr[0] = "Request.Url.Host";
dr[1] = Request.Url.Host;
dt.Rows.Add(dr);

dr = dt.NewRow();
dr[0] = "Request.Url.Port";
dr[1] = Request.Url.Port;
dt.Rows.Add(dr);

dr = dt.NewRow();
dr[0] = "Request.Url.Authority";
dr[1] = Request.Url.Authority;
dt.Rows.Add(dr);

dr = dt.NewRow();
dr[0] = "Request.Url.LocalPath";
dr[1] = Request.Url.LocalPath;
dt.Rows.Add(dr);

dr = dt.NewRow();
dr[0] = "Request.PathInfo";
dr[1] = Request.PathInfo;
dt.Rows.Add(dr);

dr = dt.NewRow();
dr[0] = "Request.Url.PathAndQuery";
dr[1] = Request.Url.PathAndQuery;
dt.Rows.Add(dr);

dr = dt.NewRow();
dr[0] = "Request.Url.Query";
dr[1] = Request.Url.Query;
dt.Rows.Add(dr);

// 應該無法取得任何資料，通常 Browser 不會送出 "#topic"
dr = dt.NewRow();
dr[0] = "Request.Url.Fragment";
dr[1] = Request.Url.Fragment;
dt.Rows.Add(dr);

dr = dt.NewRow();
dr[0] = "Request.Url.Segments[1].Replace(\\" / \\", \\"\\")";
dr[1] = Request.Url.Segments[1].Replace("/", "");
dt.Rows.Add(dr);

return View(dt);

@using System.Data
@model DataTable

@if (Model.Rows.Count > 0)
{
    <table border="1">
        <thead>
            <tr>
                @foreach (DataColumn col in Model.Columns)
                {
                    <th style="padding: 10px;">@col.ColumnName</th>
                }
            </tr>
        </thead>
        @foreach (DataRow row in Model.Rows)
        {
            <tr>
                @foreach (DataColumn col in Model.Columns)
                {
                    <td style="padding: 10px;">@row[col.ColumnName]</td>
                }
            </tr>
        }
    </table>
}

參考：

HttpRequestBase 類別

ASP.NET 如何取得 Request URL 的各個部分