通过Web服务返回大尺寸字符串时iis出现错误

Question

我想通过webservice返回图像，所以我尝试将数据库中的图像转换为byte然后从byte转换为base64字符串并将其返回到webservice，我已经完成了一半，但是由于以下原因我无法返回整个字符串希望字符串大小的一些限制或其他？

<%@ WebService Language="C#" Class="Service" %>


using System;

using System.Web;
using System.Web.Services;
using System.Web.Services.Protocols;

using System.Collections;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;

using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.IO;

[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
// To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line. 
// [System.Web.Script.Services.ScriptService]
public class Service : System.Web.Services.WebService
{
    public Service () {

        //Uncomment the following line if using designed components 
        //InitializeComponent(); 
    }

    [WebMethod]
    public string IMAGE(string ID)
    {


        SqlConnection conn = new SqlConnection("Data Source=NEWCRISP19;Initial Catalog=masselango;Persist Security Info=True;User");
        conn.Open();
        SqlDataAdapter sdImageSource = new SqlDataAdapter();
        sdImageSource.SelectCommand = new SqlCommand("select ImageData from ImagesStore where ImageId=('" + ID + "')", conn);
        DataSet dsImage = new DataSet();
        sdImageSource.Fill(dsImage);

        byte[] blob = (byte[])dsImage.Tables[0].Rows[0][0];
        String c = Convert.ToBase64String(blob);
        //c = c.Replace(" ", "");
        return c;


    }

}

web.config未被修改。

帮助我检索整个base64字符串。

Answer 1

我了解的是您已将图像以二进制形式存储在数据库中，并且现在要检索它。

如果那是您想要的，请检查此链接的二进制图像插入和检索