base64 图像不显示在 mvc 视图中答案

【问题标题】：base64 image not display in mvc viewbase64 图像不显示在 mvc 视图中
【发布时间】：2018-03-06 13:35:13
【问题描述】：

我想在 mvc 中显示图像图像存储在数据库中文件类型是图像，我想首先获取图像我正在转换字节，然后我想在视图中显示我正在尝试一切，但图像不只显示空白矩形显示。

conn.Open();

using (SqlCommand cmd1 = new SqlCommand("select  isnull(ClientPic,'') as ClientPic from MembersDetail where Srno=1 and MemberShipID='" + clsCommon._MembershipID + "'", conn))
{
    cmd1.CommandType = CommandType.Text;

    SqlDataAdapter ad = new SqlDataAdapter(cmd1);
    DataTable mdt_pic = new DataTable();
    ad.Fill(mdt_pic);

    for (int i = 0; i < mdt_pic.Rows.Count; i++)
    {
        ViewBag.Pic = obj_u.ClientPic = "data:image/png;base64," + Convert.ToBase64String((byte[])mdt_pic.Rows[i]["ClientPic"]);   
    }
    conn.Close();
}

<img src="@ViewBag.Pic" alt="User" />

【问题讨论】：

标签： c# asp.net-mvc-4 model-view-controller ado.net

【解决方案1】：

您不需要使用 base64。您应该将文件作为 FileContentResult 获取

public ActionResult GetFile() // note should accept an id or something
{
    byte[] bytes = null;
    conn.Open();
    using (SqlCommand cmd1 = new SqlCommand("select  isnull(ClientPic,'') as ClientPic from MembersDetail where Srno=1 and MemberShipID='" + clsCommon._MembershipID + "'", conn))
    {
        cmd1.CommandType = CommandType.Text;

        SqlDataAdapter ad = new SqlDataAdapter(cmd1);
        DataTable mdt_pic = new DataTable();
        ad.Fill(mdt_pic);

        for (int i = 0; i < mdt_pic.Rows.Count; i++)
        {
             bytes = (byte[])mdt_pic.Rows[i]["ClientPic"];
        }
        conn.Close();

    }
    return new FileContentResult(bytes, "image/png"); // content type may be different for any file
}

然后调用src中的action：

<img src="GetFile" alt="User" />

【讨论】：