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);