C#使用Newtonsoft.Json读写json、读写Base64图像

---

废话不多说，直接上最精炼的代码，假设json串如下：

{

    "key1": "val1",

    "key2": {

        "obj1": ["a", "b", "c"],

        "obj2": 12.3

    }

}

解析json串：

JObject jsonObj = (JObject)JsonConvert.DeserializeObject("{'key1':'val1','key2':{'obj1':['a','b','c'],'obj2':12.3}}");

string val = (string)jsonObj["key1"];

JArray arry = (JArray)jsonObj["key2"]["obj1"];

string valb = (string)arry[1];

double val2 = (double)jsonObj["key2"]["obj2"];

创建json串：

JObject obj= new JObject();

obj["key1"] = "val1";

JObject objKey2 = new JObject();

JArray  arry1 = new JArray() { "a","b","c"};

objKey2["obj1"] = arry1;

objKey2["obj2"] = 12.3;

obj["key2"] = objKey2;

string json = obj.ToString();

下面是一个更复杂的例子，假设json串如下：

{

  "txtRectangWidth": "100",

  "txtRectangHeight": "50",

  "txtRectangPrintWidth": "25",

  "txtRectangPrintHeight": "12.5",

  "txtLabelWidth": "40",

  "txtLabelHeight": "30",

  "txtLabelMoveUp": "0",

  "txtLabelMoveLeft": "0",

  "cBoxPrintDirect": "0",

  "cBoxPrinterName": "",

  "chkShowPrintingPreview": "0",

  "chkLogoAble": "0",

  "chkTextAble": "0",

  "chkBarcodeAble": "0",

  "chkQrcodeAble": "0",

  "chkLineAble": "0",

  "chkRectangleAble": "0",

  "LogoAble": [

    {

      "txtLogoTop": "0",

      "txtLogoLeft": "0",

      "txtLogoWidth": "30",

      "txtLogoHeight": "12",

      "txtLogoPath": "",

      "txtLogoUrl": ""

    }

  ],

  "TextAble": [

    {

      "txtTextTop": "0",

      "txtTextLeft": "0",

      "txtTextWidth": "0",

      "cBoxTextFontSize": "9",

      "cBoxTextFontFamily": "微软雅黑",

      "txtTextContent": "代码：DSC103231\r\n名称：标签打印机\r\n型号：DH3210\r\n日期：2022-1-1\r\n状态：合格\r\n仓位：A312",

      "cBoxTextType": "文字",

      "radioTextScale": "1",

      "radioTextDirectWrap": "0",

      "chkTextBold": "0",

      "chkTextDirect": "0"

    }

  ],

  "BarcodeAble": [

    {

      "cBoxBarcodeType": "CODE128",

      "txtBarcodeWidth": "30",

      "txtBarcodeHeight": "10",

      "txtBarcodeTop": "0",

      "txtBarcodeLeft": "0",

      "txtBarCode": "P0123456789"

    }

  ],

  "QrcodeAble": [

    {

      "txtQrcodeWidth": "15",

      "txtQrcodeTop": "14",

      "txtQrcodeLeft": "24",

      "txtQRCode": "DEMO:www.clicksun.cn",

      "txtQrcodeAdjustNum": "1"

    }

  ],

  "LineAble": [

    {

      "cBoxLineDirect": "横线",

      "txtLineTop": "0",

      "txtLineLeft": "0",

      "txtLineLength": "15",

      "txtLineWidth": "1",

      "cBoxLineStyle": "实线"

    }

  ],

  "RectangleAble": [

    {

      "txtRectangleTop": "0",

      "txtRectangleLeft": "0",

      "txtRectangleWidth": "36",

      "txtRectangleHeight": "26",

      "txtRectangleBorderWidth": "1",

      "cBoxRectangleStyle": "实线"

    }

  ]

}

解析json串：

try

{

    string tmpPath = "";

    OpenFileDialog fileDialog = new OpenFileDialog();

    fileDialog.Multiselect = false;

    fileDialog.Title = "请选择json文件路径";

    fileDialog.Filter = "json文件|*.json";

    if (fileDialog.ShowDialog() == DialogResult.OK)

    {

        string[] DragFilePaths = fileDialog.FileNames;

        foreach (string DragFilePath in DragFilePaths)

        {

            FileInfo NewAddFile = new FileInfo(DragFilePath);

            tmpPath = NewAddFile.FullName;

            break;

        }

    }

    if (tmpPath == "") { return; }

    //读入外部json文件

    StreamReader reader = File.OpenText(tmpPath);

    JsonTextReader jsonTextReader = new JsonTextReader(reader);

    JObject jsonObject = (JObject)JToken.Readfrom(jsonTextReader);

    //JObject jsonObject = (JObject)JToken.Parse(jsonText);  //直接从string加载

    txtRectangWidth.Text = jsonObject["txtRectangWidth"].ToString();

    txtRectangHeight.Text = jsonObject["txtRectangHeight"].ToString();

    txtRectangPrintWidth.Text = jsonObject["txtRectangPrintWidth"].ToString();

    txtRectangPrintHeight.Text = jsonObject["txtRectangPrintHeight"].ToString();

    txtLabelWidth.Text = jsonObject["txtLabelWidth"].ToString();

    txtLabelHeight.Text = jsonObject["txtLabelHeight"].ToString();

    txtLabelMoveUp.Text = jsonObject["txtLabelMoveUp"].ToString();

    txtLabelMoveLeft.Text = jsonObject["txtLabelMoveLeft"].ToString();

    cBoxPrintDirect.Text = jsonObject["cBoxPrintDirect"].ToString();

    cBoxPrinterName.Text = jsonObject["cBoxPrinterName"].ToString();

    if (jsonObject["cBoxPrintDirect"].ToString() == "1") { chkPrintTestRectangle.Checked = true; } else { chkPrintTestRectangle.Checked = false; }

    if (jsonObject["chkShowPrintingPreview"].ToString() == "1") { chkShowPrintingPreview.Checked = true; } else { chkShowPrintingPreview.Checked = false; }

    if (jsonObject["chkLogoAble"].ToString() == "1") { chkLogoAble.Checked = true; } else { chkLogoAble.Checked = false; }

    if (jsonObject["chkTextAble"].ToString() == "1") { chkTextAble.Checked = true; } else { chkTextAble.Checked = false; }

    if (jsonObject["chkBarcodeAble"].ToString() == "1") { chkBarcodeAble.Checked = true; } else { chkBarcodeAble.Checked = false; }

    if (jsonObject["chkQrcodeAble"].ToString() == "1") { chkQrcodeAble.Checked = true; } else { chkQrcodeAble.Checked = false; }

    if (jsonObject["chkLineAble"].ToString() == "1") { chkLineAble.Checked = true; } else { chkLineAble.Checked = false; }

    if (jsonObject["chkRectangleAble"].ToString() == "1") { chkRectangleAble.Checked = true; } else { chkRectangleAble.Checked = false; }

    //读取LogoAble

    txtLogoTop.Text = jsonObject["LogoAble"][0]["txtLogoTop"].ToString();

    txtLogoLeft.Text = jsonObject["LogoAble"][0]["txtLogoLeft"].ToString();

    txtLogoWidth.Text = jsonObject["LogoAble"][0]["txtLogoWidth"].ToString();

    txtLogoHeight.Text = jsonObject["LogoAble"][0]["txtLogoHeight"].ToString();

    txtLogoPath.Text = jsonObject["LogoAble"][0]["txtLogoPath"].ToString();

    txtLogoUrl.Text = jsonObject["LogoAble"][0]["txtLogoUrl"].ToString();

    //读取TextAble

    txtTextTop.Text = jsonObject["TextAble"][0]["txtTextTop"].ToString();

    txtTextLeft.Text = jsonObject["TextAble"][0]["txtTextLeft"].ToString();

    txtTextWidth.Text = jsonObject["TextAble"][0]["txtTextWidth"].ToString();

    cBoxTextFontSize.Text = jsonObject["TextAble"][0]["cBoxTextFontSize"].ToString();

    cBoxTextFontFamily.Text = jsonObject["TextAble"][0]["cBoxTextFontFamily"].ToString();

    txtTextContent.Text = jsonObject["TextAble"][0]["txtTextContent"].ToString();

    cBoxTextType.Text = jsonObject["TextAble"][0]["cBoxTextType"].ToString();

    if (jsonObject["TextAble"][0]["radioTextScale"].ToString() == "1") { radioTextScale.Checked = true; } else { radioTextScale.Checked = false; }

    if (jsonObject["TextAble"][0]["radioTextDirectWrap"].ToString() == "1") { radioTextDirectWrap.Checked = true; } else { radioTextDirectWrap.Checked = false; }

    if (jsonObject["TextAble"][0]["chkTextBold"].ToString() == "1") { chkTextBold.Checked = true; } else { chkTextBold.Checked = false; }

    if (jsonObject["TextAble"][0]["chkTextDirect"].ToString() == "1") { chkTextDirect.Checked = true; } else { chkTextDirect.Checked = false; }

    //读取BarcodeAble

    cBoxBarcodeType.Text = jsonObject["BarcodeAble"][0]["cBoxBarcodeType"].ToString();

    txtBarcodeWidth.Text = jsonObject["BarcodeAble"][0]["txtBarcodeWidth"].ToString();

    txtBarcodeHeight.Text = jsonObject["BarcodeAble"][0]["txtBarcodeHeight"].ToString();

    txtBarcodeTop.Text = jsonObject["BarcodeAble"][0]["txtBarcodeTop"].ToString();

    txtBarcodeLeft.Text = jsonObject["BarcodeAble"][0]["txtBarcodeLeft"].ToString();

    txtBarCode.Text = jsonObject["BarcodeAble"][0]["txtBarCode"].ToString();

    //读取QrcodeAble

    txtQrcodeWidth.Text = jsonObject["QrcodeAble"][0]["txtQrcodeWidth"].ToString();

    txtQrcodeTop.Text = jsonObject["QrcodeAble"][0]["txtQrcodeTop"].ToString();

    txtQrcodeLeft.Text = jsonObject["QrcodeAble"][0]["txtQrcodeLeft"].ToString();

    txtQRCode.Text = jsonObject["QrcodeAble"][0]["txtQRCode"].ToString();

    txtQrcodeAdjustNum.Text = jsonObject["QrcodeAble"][0]["txtQrcodeAdjustNum"].ToString();

    //读取LineAble

    cBoxLineDirect.Text = jsonObject["LineAble"][0]["cBoxLineDirect"].ToString();

    txtLineTop.Text = jsonObject["LineAble"][0]["txtLineTop"].ToString();

    txtLineLeft.Text = jsonObject["LineAble"][0]["txtLineLeft"].ToString();

    txtLineLength.Text = jsonObject["LineAble"][0]["txtLineLength"].ToString();

    txtLineWidth.Text = jsonObject["LineAble"][0]["txtLineWidth"].ToString();

    cBoxLineStyle.Text = jsonObject["LineAble"][0]["cBoxLineStyle"].ToString();

    //读取RectangleAble

    txtRectangleTop.Text = jsonObject["RectangleAble"][0]["txtRectangleTop"].ToString();

    txtRectangleLeft.Text = jsonObject["RectangleAble"][0]["txtRectangleLeft"].ToString();

    txtRectangleWidth.Text = jsonObject["RectangleAble"][0]["txtRectangleWidth"].ToString();

    txtRectangleHeight.Text = jsonObject["RectangleAble"][0]["txtRectangleHeight"].ToString();

    txtRectangleBorderWidth.Text = jsonObject["RectangleAble"][0]["txtRectangleBorderWidth"].ToString();

    cBoxRectangleStyle.Text = jsonObject["RectangleAble"][0]["cBoxRectangleStyle"].ToString();

    reader.Close();

}

catch (Exception ex)

{

    MessageBox.Show("保存失败，错误原因：\r\n" + ex.Message, "保存失败", MessageBoxButtons.OK, MessageBoxIcon.Stop);

}

创建json串并保存到指定文件：

try

{

    string tmpPath = SaveFilePathName("","json文件|*.json","将本模板另存为json文件");

    if (tmpPath=="") { return; }

    JObject jsonObject = new JObject();

    jsonObject["txtRectangWidth"] = txtRectangWidth.Text;

    jsonObject["txtRectangHeight"] = txtRectangHeight.Text;

    jsonObject["txtRectangPrintWidth"] = txtRectangPrintWidth.Text;

    jsonObject["txtRectangPrintHeight"] = txtRectangPrintHeight.Text;

    jsonObject["txtLabelWidth"] = txtLabelWidth.Text;

    jsonObject["txtLabelHeight"] = txtLabelHeight.Text;

    jsonObject["txtLabelMoveUp"] = txtLabelMoveUp.Text;

    jsonObject["txtLabelMoveLeft"] = txtLabelMoveLeft.Text;

    jsonObject["cBoxPrintDirect"] = cBoxPrintDirect.Text;

    jsonObject["cBoxPrinterName"] = cBoxPrinterName.Text;

    if (chkPrintTestRectangle.Checked == true) { jsonObject["cBoxPrintDirect"] = "1"; } else { jsonObject["cBoxPrintDirect"] = "0"; }

    if (chkShowPrintingPreview.Checked == true) { jsonObject["chkShowPrintingPreview"] = "1"; } else { jsonObject["chkShowPrintingPreview"] = "0"; }

    if (chkLogoAble.Checked == true) { jsonObject["chkLogoAble"] = "1"; } else { jsonObject["chkLogoAble"] = "0"; }

    if (chkTextAble.Checked == true) { jsonObject["chkTextAble"] = "1"; } else { jsonObject["chkTextAble"] = "0"; }

    if (chkBarcodeAble.Checked == true) { jsonObject["chkBarcodeAble"] = "1"; } else { jsonObject["chkBarcodeAble"] = "0"; }

    if (chkQrcodeAble.Checked == true) { jsonObject["chkQrcodeAble"] = "1"; } else { jsonObject["chkQrcodeAble"] = "0"; }

    if (chkLineAble.Checked == true) { jsonObject["chkLineAble"] = "1"; } else { jsonObject["chkLineAble"] = "0"; }

    if (chkRectangleAble.Checked == true) { jsonObject["chkRectangleAble"] = "1"; } else { jsonObject["chkRectangleAble"] = "0"; }

    //写入LogoAble

    JObject jObjLogoAble = new JObject();

    jObjLogoAble["txtLogoTop"] = txtLogoTop.Text;

    jObjLogoAble["txtLogoLeft"] = txtLogoLeft.Text;

    jObjLogoAble["txtLogoWidth"] = txtLogoWidth.Text;

    jObjLogoAble["txtLogoHeight"] = txtLogoHeight.Text;

    jObjLogoAble["txtLogoPath"] = txtLogoPath.Text;

    jObjLogoAble["txtLogoUrl"] = txtLogoUrl.Text;

    JArray arrayLogoAble = new JArray() { jObjLogoAble };

    jsonObject["LogoAble"] = arrayLogoAble;

    //写入TextAble

    JObject jObjTextAble = new JObject();

    jObjTextAble["txtTextTop"] = txtTextTop.Text;

    jObjTextAble["txtTextLeft"] = txtTextLeft.Text;

    jObjTextAble["txtTextWidth"] = txtTextWidth.Text;

    jObjTextAble["cBoxTextFontSize"] = cBoxTextFontSize.Text;

    jObjTextAble["cBoxTextFontFamily"] = cBoxTextFontFamily.Text;

    jObjTextAble["txtTextContent"] = txtTextContent.Text;

    jObjTextAble["cBoxTextType"] = cBoxTextType.Text;

    if (radioTextScale.Checked == true) { jObjTextAble["radioTextScale"] = "1"; } else { jObjTextAble["radioTextScale"] = "0"; }

    if (radioTextDirectWrap.Checked == true) { jObjTextAble["radioTextDirectWrap"] = "1"; } else { jObjTextAble["radioTextDirectWrap"] = "0"; }

    if (chkTextBold.Checked == true) { jObjTextAble["chkTextBold"] = "1"; } else { jObjTextAble["chkTextBold"] = "0"; }

    if (chkTextDirect.Checked == true) { jObjTextAble["chkTextDirect"] = "1"; } else { jObjTextAble["chkTextDirect"] = "0"; }

    JArray arrayTextAble = new JArray() { jObjTextAble };

    jsonObject["TextAble"] = arrayTextAble;

    //写入BarcodeAble

    JObject jObjBarcodeAble = new JObject();

    jObjBarcodeAble["cBoxBarcodeType"] = cBoxBarcodeType.Text;

    jObjBarcodeAble["txtBarcodeWidth"] = txtBarcodeWidth.Text;

    jObjBarcodeAble["txtBarcodeHeight"] = txtBarcodeHeight.Text;

    jObjBarcodeAble["txtBarcodeTop"] = txtBarcodeTop.Text;

    jObjBarcodeAble["txtBarcodeLeft"] = txtBarcodeLeft.Text;

    jObjBarcodeAble["txtBarCode"] = txtBarCode.Text;

    JArray arrayBarcodeAble = new JArray() { jObjBarcodeAble };

    jsonObject["BarcodeAble"] = arrayBarcodeAble;

    //写入QrcodeAble

    JObject jObjQrcodeAble = new JObject();

    jObjQrcodeAble["txtQrcodeWidth"] = txtQrcodeWidth.Text;

    jObjQrcodeAble["txtQrcodeTop"] = txtQrcodeTop.Text;

    jObjQrcodeAble["txtQrcodeLeft"] = txtQrcodeLeft.Text;

    jObjQrcodeAble["txtQRCode"] = txtQRCode.Text;

    jObjQrcodeAble["txtQrcodeAdjustNum"] = txtQrcodeAdjustNum.Text;

    JArray arrayQrcodeAble = new JArray() { jObjQrcodeAble };

    jsonObject["QrcodeAble"] = arrayQrcodeAble;

    //写入LineAble

    JObject jObjLineAble = new JObject();

    jObjLineAble["cBoxLineDirect"] = cBoxLineDirect.Text;

    jObjLineAble["txtLineTop"] = txtLineTop.Text;

    jObjLineAble["txtLineLeft"] = txtLineLeft.Text;

    jObjLineAble["txtLineLength"] = txtLineLength.Text;

    jObjLineAble["txtLineWidth"] = txtLineWidth.Text;

    jObjLineAble["cBoxLineStyle"] = cBoxLineStyle.Text;

    JArray arrayLineAble = new JArray() { jObjLineAble };

    jsonObject["LineAble"] = arrayLineAble;

    //写入RectangleAble

    JObject jObjRectangleAble = new JObject();

    jObjRectangleAble["txtRectangleTop"] = txtRectangleTop.Text;

    jObjRectangleAble["txtRectangleLeft"] = txtRectangleLeft.Text;

    jObjRectangleAble["txtRectangleWidth"] = txtRectangleWidth.Text;

    jObjRectangleAble["txtRectangleHeight"] = txtRectangleHeight.Text;

    jObjRectangleAble["txtRectangleBorderWidth"] = txtRectangleBorderWidth.Text;

    jObjRectangleAble["cBoxRectangleStyle"] = cBoxRectangleStyle.Text;

    JArray arrayRectangleAble = new JArray() { jObjRectangleAble };

    jsonObject["RectangleAble"] = arrayRectangleAble;

    //保存json文件

    string output = Newtonsoft.Json.JsonConvert.SerializeObject(jsonObject, Newtonsoft.Json.Formatting.Indented);

    File.WriteAllText(tmpPath, output);

}

catch(Exception ex)

{

    MessageBox.Show("保存失败，错误原因：\r\n" + ex.Message, "保存失败", MessageBoxButtons.OK, MessageBoxIcon.Stop);

}

/// <summary>

/// 选择保存文件的名称以及路径  取消返回 空"";

/// </summary>

/// <param name="fileName"></param>

/// <param name="filter"></param>

/// <param name="title"></param>

/// <returns></returns>

public static string SaveFilePathName(string fileName = null, string filter = null, string title = null)

{

    string path = "";

    SaveFileDialog fbd = new SaveFileDialog();

    if (!string.IsNullOrEmpty(fileName))

    {

        fbd.FileName = fileName;

    }

    if (!string.IsNullOrEmpty(filter))

    {

        fbd.Filter = filter;// "Excel|*.xls;*.xlsx;";

    }

    if (!string.IsNullOrEmpty(title))

    {

        fbd.Title = title;// "保存为";

    }

    if (fbd.ShowDialog() == DialogResult.OK)

    {

        path = fbd.FileName;

    }

    return path;

}

=====读写base64图像=====

将图像写入json：

JObject obj = new JObject();

obj["img"] = Convert.ToBase64String(Imgbytes);

string jsonStr = obj.ToString();

将json中的图像取出：

JObject jsonObj = (JObject)JsonConvert.DeserializeObject(jsonStr);

string imgStr = (string)jsonObj["img"];

byte[] Imgbytes = Convert.fromBase64String(imgStr);

该文章在 2022/8/11 0:52:23 编辑过