介绍
在程序调用Onnx模型时，一般都会查看一下模型的属性、输入、输出信息，一般可以不看模型具体的信息。可以使用Netron查看，Netron地址：https://netron.app/在线查看时需要有网，模型越大加载越慢。大多时候只想快速查看一下模型的输入、输出信息，所以自己写了一个C#Onnx模型信息查看工具。

效果

Netron效果

开发环境
VS2022
.net framework 4.8
OpenCvSharp 4.8
Microsoft.ML.OnnxRuntime 1.16.2

代码

using Microsoft.ML.OnnxRuntime;
using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
 
namespace Onnx_Demo
{
    public partial class frmMain : Form
    {
        public frmMain()
        {
            InitializeComponent();
        }
        // 堆代码 duidaima.com
        string fileFilter = "*.*|*.onnx;";
        string model_path;
 
        StringBuilder sb = new StringBuilder();
        InferenceSession onnx_session;
 
        private void button1_Click(object sender, EventArgs e)
        {
            OpenFileDialog ofd = new OpenFileDialog();
            ofd.Filter = fileFilter;
            if (ofd.ShowDialog() != DialogResult.OK) return;
 
            txtInfo.Text = "";
            model_path = ofd.FileName;
            txtPath.Text = model_path;
 
            txtInfo.Text = "正在读取，请稍后……";
            Application.DoEvents();
 
            ShowInfo(model_path);
        }
 
        void ShowInfo(string model_path)
        {
            try
            {
                onnx_session = new InferenceSession(model_path);
            }
            catch (Exception ex)
            {
                MessageBox.Show("读取模型异常:" + ex.Message);
            }
            sb.Clear();
 
            //Model Properties
            sb.AppendLine("Model Properties");
            sb.AppendLine("-------------------------");
            Dictionary<string, string> CustomMetadataMap = onnx_session.ModelMetadata.CustomMetadataMap;
            foreach (string key in CustomMetadataMap.Keys)
            {
                sb.AppendLine(String.Format("{0}：{1}",key, CustomMetadataMap[key])) ;
            }
            sb.AppendLine("---------------------------------------------------------------");
 
            IReadOnlyList<string> InputNames = onnx_session.InputNames;
            IReadOnlyDictionary<string, NodeMetadata> InputMetadata = onnx_session.InputMetadata;
            //Inputs
            sb.AppendLine("");
            sb.AppendLine("Inputs");
            sb.AppendLine("-------------------------");
 
            foreach (var item in InputMetadata)
            {
                sb.AppendLine("name：" + item.Key);
                NodeMetadata  nmData= item.Value;
                int[] dim = nmData.Dimensions;
                sb.AppendLine("tensor：" + nmData.ElementDataType.ToString()+"["+ String.Join(", ", dim)+"]");
            }
            sb.AppendLine("---------------------------------------------------------------");
 
 
            IReadOnlyList<string> OutputNames = onnx_session.OutputNames;
            IReadOnlyDictionary<string, NodeMetadata> OutputMetadata = onnx_session.OutputMetadata;
            //Outputs
            sb.AppendLine("");
            sb.AppendLine("Outputs");
            sb.AppendLine("-------------------------");
 
            foreach (var item in OutputMetadata)
            {
                sb.AppendLine("name：" + item.Key);
                NodeMetadata nmData = item.Value;
                int[] dim = nmData.Dimensions;
                sb.AppendLine("tensor：" + nmData.ElementDataType.ToString() + "[" + String.Join(", ", dim) + "]");
            }
            sb.AppendLine("---------------------------------------------------------------");
 
            txtInfo.Text = sb.ToString();
 
        }
 
        private void Form1_Load(object sender, EventArgs e)
        {
 
 
        }
 
    }
}