Dynamics CRM 2015/2016新特性之二十七：使用Web API查询元数据

var clientURL = Xrm.Page.context.getClientUrl();
var req = new XMLHttpRequest()
req.open("GET", encodeURI(clientURL + "/api/data/v8.0/EntityDefinitions?$filter=SchemaName eq ‘ly_Test‘"), true);
req.setRequestHeader("Accept", "application/json");
req.setRequestHeader("Content-Type", "application/json; charset=utf-8");
req.setRequestHeader("OData-MaxVersion", "4.0");
req.setRequestHeader("OData-Version", "4.0");
req.onreadystatechange = function () {
    if (this.readyState == 4) {
        req.onreadystatechange = null;
        if (this.status == 200) {
            var responseJSON = JSON.parse(this.responseText);
            Xrm.Utility.alertDialog("查询到的元数据ID是" + responseJSON.value[0]["MetadataId"] + ",实体复数显示名称是:" + responseJSON.value[0].DisplayCollectionName.LocalizedLabels[0].Label + "，主属性是:" + responseJSON.value[0].PrimaryNameAttribute);
        }
        else {
            var error = JSON.parse(this.responseText).error;
            Xrm.Utility.alertDialog("查询罗勇测试实体元数据出错." + error.message);
        }
    }
};
req.send();

var clientURL = Xrm.Page.context.getClientUrl();
var req = new XMLHttpRequest()
req.open("GET", encodeURI(clientURL + "/api/data/v8.0/EntityDefinitions?$select=DisplayCollectionName,PrimaryNameAttribute,SchemaName&$filter=IsCustomizable/Value eq true&$count=true"), true);
req.setRequestHeader("Accept", "application/json");
req.setRequestHeader("Content-Type", "application/json; charset=utf-8");
req.setRequestHeader("OData-MaxVersion", "4.0");
req.setRequestHeader("OData-Version", "4.0");
req.onreadystatechange = function () {
    if (this.readyState == 4) {
        req.onreadystatechange = null;
        if (this.status == 200) {
            var responseJSON = JSON.parse(this.responseText);
            Xrm.Utility.alertDialog("共有" + responseJSON["@odata.count"] + "个实体可以定制，第一个实体的元数据ID是" + responseJSON.value[0]["MetadataId"] + ",实体复数显示名称是:" + responseJSON.value[0].DisplayCollectionName.LocalizedLabels[0].Label + ",架构名称是:" + responseJSON.value[0].SchemaName + ",主属性是:" + responseJSON.value[0].PrimaryNameAttribute);
        }
        else {
            var error = JSON.parse(this.responseText).error;
            Xrm.Utility.alertDialog("查询罗勇测试实体元数据出错." + error.message);
        }
    }
};
req.send();

var clientURL = Xrm.Page.context.getClientUrl();
var req = new XMLHttpRequest()
req.open("GET", encodeURI(clientURL + "/api/data/v8.0/EntityDefinitions(e373eab4-9ca4-e511-80cc-000d3a80ce7f)?$select=SchemaName&$expand=Attributes($select=SchemaName;$filter=AttributeType eq Microsoft.Dynamics.CRM.AttributeTypeCode‘String‘ and IsCustomizable/Value eq true and IsCustomAttribute eq true and IsLogical eq false)"), true);
req.setRequestHeader("Accept", "application/json");
req.setRequestHeader("Content-Type", "application/json; charset=utf-8");
req.setRequestHeader("OData-MaxVersion", "4.0");
req.setRequestHeader("OData-Version", "4.0");
req.onreadystatechange = function () {
    if (this.readyState == 4) {
        req.onreadystatechange = null;
        if (this.status == 200) {
            var stringFields = "";
            var responseJSON = JSON.parse(this.responseText);
            if (responseJSON.Attributes != null && responseJSON.Attributes.length >= 1) {
                for (var i = 0; i < responseJSON.Attributes.length; i++) {
                    stringFields += responseJSON.Attributes[i].SchemaName + ";";
                }
            }
            if (stringFields != "") {
                Xrm.Utility.alertDialog("这个实体的文本字段有" + stringFields.substring(0, stringFields.length - 1));
            }
        }
        else {
            var error = JSON.parse(this.responseText).error;
            Xrm.Utility.alertDialog("查询罗勇测试实体元数据出错." + error.message);
        }
    }
};
req.send();